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class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">移至側邊欄</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">隱藏</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">序言</div> </a> </li> <li id="toc-數" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#數"> <div class="vector-toc-text"> <span class="vector-toc-numb">一</span> <span>數</span> </div> </a> <ul id="toc-數-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="目次" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="切換目次" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">切換目次</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">四</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="前往別種語言的條目。有一六二種語言可用" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-162" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">一六二種語言</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ab mw-list-item"><a href="https://ab.wikipedia.org/wiki/4_(%D0%B0%D1%85%D1%8B%D4%A5%D1%85%D1%8C%D0%B0%D3%A1%D0%B0%D1%80%D0%B0)" title="4 (ахыԥхьаӡара) – 阿布哈茲文" lang="ab" hreflang="ab" data-title="4 (ахыԥхьаӡара)" data-language-autonym="Аԥсшәа" data-language-local-name="阿布哈茲文" class="interlanguage-link-target"><span>Аԥсшәа</span></a></li><li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/4_(getal)" title="4 (getal) – 南非荷蘭文" lang="af" hreflang="af" data-title="4 (getal)" data-language-autonym="Afrikaans" data-language-local-name="南非荷蘭文" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%8A%A0%E1%88%AB%E1%89%B5" title="አራት – 阿姆哈拉文" lang="am" hreflang="am" data-title="አራት" data-language-autonym="አማርኛ" data-language-local-name="阿姆哈拉文" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-ang mw-list-item"><a href="https://ang.wikipedia.org/wiki/F%C4%93ower" title="Fēower – 古英文" lang="ang" hreflang="ang" data-title="Fēower" data-language-autonym="Ænglisc" data-language-local-name="古英文" class="interlanguage-link-target"><span>Ænglisc</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/4_(%D8%B9%D8%AF%D8%AF)" title="4 (عدد) – 阿拉伯文" lang="ar" hreflang="ar" data-title="4 (عدد)" data-language-autonym="العربية" data-language-local-name="阿拉伯文" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-arc mw-list-item"><a href="https://arc.wikipedia.org/wiki/4_(%DC%A1%DC%A2%DC%9D%DC%A2%DC%90)" title="4 (ܡܢܝܢܐ) – 阿拉米文" lang="arc" hreflang="arc" data-title="4 (ܡܢܝܢܐ)" data-language-autonym="ܐܪܡܝܐ" data-language-local-name="阿拉米文" class="interlanguage-link-target"><span>ܐܪܡܝܐ</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/4" title="4 – 摩洛哥阿拉伯文" lang="ary" hreflang="ary" data-title="4" data-language-autonym="الدارجة" data-language-local-name="摩洛哥阿拉伯文" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A7%AA" title="৪ – 阿薩姆文" lang="as" hreflang="as" data-title="৪" data-language-autonym="অসমীয়া" data-language-local-name="阿薩姆文" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Cuatro" title="Cuatro – 阿斯圖里亞文" lang="ast" hreflang="ast" data-title="Cuatro" data-language-autonym="Asturianu" data-language-local-name="阿斯圖里亞文" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-av mw-list-item"><a href="https://av.wikipedia.org/wiki/%D0%A3%D0%BD%D0%BA%D1%8A%D0%BE" title="Ункъо – 阿瓦爾文" lang="av" hreflang="av" data-title="Ункъо" data-language-autonym="Авар" data-language-local-name="阿瓦爾文" class="interlanguage-link-target"><span>Авар</span></a></li><li class="interlanguage-link interwiki-ay mw-list-item"><a href="https://ay.wikipedia.org/wiki/Pusi" title="Pusi – 艾馬拉文" lang="ay" hreflang="ay" data-title="Pusi" data-language-autonym="Aymar aru" data-language-local-name="艾馬拉文" class="interlanguage-link-target"><span>Aymar aru</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/4_(%C9%99d%C9%99d)" title="4 (ədəd) – 亞塞拜然文" lang="az" hreflang="az" data-title="4 (ədəd)" data-language-autonym="Azərbaycanca" data-language-local-name="亞塞拜然文" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%DB%B4_(%D8%B3%D8%A7%DB%8C%DB%8C)" title="۴ (سایی) – South Azerbaijani" lang="azb" hreflang="azb" data-title="۴ (سایی)" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-ban mw-list-item"><a href="https://ban.wikipedia.org/wiki/4_(angka)" title="4 (angka) – 峇里文" lang="ban" hreflang="ban" data-title="4 (angka)" data-language-autonym="Basa Bali" data-language-local-name="峇里文" class="interlanguage-link-target"><span>Basa Bali</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/4_(%D0%BB%D1%96%D0%BA)" title="4 (лік) – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="4 (лік)" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/4_(%D1%87%D0%B8%D1%81%D0%BB%D0%BE)" title="4 (число) – 保加利亞文" lang="bg" hreflang="bg" data-title="4 (число)" data-language-autonym="Български" data-language-local-name="保加利亞文" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bi mw-list-item"><a href="https://bi.wikipedia.org/wiki/Fo" title="Fo – 比斯拉馬文" lang="bi" hreflang="bi" data-title="Fo" data-language-autonym="Bislama" data-language-local-name="比斯拉馬文" class="interlanguage-link-target"><span>Bislama</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A7%AA_(%E0%A6%B8%E0%A6%82%E0%A6%96%E0%A7%8D%E0%A6%AF%E0%A6%BE)" title="৪ (সংখ্যা) – 孟加拉文" lang="bn" hreflang="bn" data-title="৪ (সংখ্যা)" data-language-autonym="বাংলা" data-language-local-name="孟加拉文" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BC%A4_(%E0%BD%82%E0%BE%B2%E0%BD%84%E0%BD%A6%E0%BC%8B%E0%BD%80%E0%BC%8D)" title="༤ (གྲངས་ཀ།) – 藏文" lang="bo" hreflang="bo" data-title="༤ (གྲངས་ཀ།)" data-language-autonym="བོད་ཡིག" data-language-local-name="藏文" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Pevar" title="Pevar – 布列塔尼文" lang="br" hreflang="br" data-title="Pevar" data-language-autonym="Brezhoneg" data-language-local-name="布列塔尼文" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/4_(broj)" title="4 (broj) – 波士尼亞文" lang="bs" hreflang="bs" data-title="4 (broj)" data-language-autonym="Bosanski" data-language-local-name="波士尼亞文" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-bug mw-list-item"><a href="https://bug.wikipedia.org/wiki/4_(nomoro)" title="4 (nomoro) – 布吉斯文" lang="bug" hreflang="bug" data-title="4 (nomoro)" data-language-autonym="Basa Ugi" data-language-local-name="布吉斯文" class="interlanguage-link-target"><span>Basa Ugi</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Quatre" title="Quatre – 加泰蘭文" lang="ca" hreflang="ca" data-title="Quatre" data-language-autonym="Català" data-language-local-name="加泰蘭文" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/4" title="4 – Mindong" lang="cdo" hreflang="cdo" data-title="4" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-ceb mw-list-item"><a href="https://ceb.wikipedia.org/wiki/4_(numero)" title="4 (numero) – 宿霧文" lang="ceb" hreflang="ceb" data-title="4 (numero)" data-language-autonym="Cebuano" data-language-local-name="宿霧文" class="interlanguage-link-target"><span>Cebuano</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%A4_(%DA%98%D9%85%D8%A7%D8%B1%DB%95)" title="٤ (ژمارە) – 中庫德文" lang="ckb" hreflang="ckb" data-title="٤ (ژمارە)" data-language-autonym="کوردی" data-language-local-name="中庫德文" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/4_(%C4%8D%C3%ADslo)" title="4 (číslo) – 捷克文" lang="cs" hreflang="cs" data-title="4 (číslo)" data-language-autonym="Čeština" data-language-local-name="捷克文" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cu mw-list-item"><a href="https://cu.wikipedia.org/wiki/%D0%A7%D1%94%D1%82%EA%99%91%D1%80%D1%94" title="Чєтꙑрє – 宗教斯拉夫文" lang="cu" hreflang="cu" data-title="Чєтꙑрє" data-language-autonym="Словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ" data-language-local-name="宗教斯拉夫文" class="interlanguage-link-target"><span>Словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/4_(%D1%85%D0%B8%D1%81%D0%B5%D0%BF)" title="4 (хисеп) – 楚瓦什文" lang="cv" hreflang="cv" data-title="4 (хисеп)" data-language-autonym="Чӑвашла" data-language-local-name="楚瓦什文" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Pedwar" title="Pedwar – 威爾斯文" lang="cy" hreflang="cy" data-title="Pedwar" data-language-autonym="Cymraeg" data-language-local-name="威爾斯文" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/4_(tal)" title="4 (tal) – 丹麥文" lang="da" hreflang="da" data-title="4 (tal)" data-language-autonym="Dansk" data-language-local-name="丹麥文" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-dag mw-list-item"><a href="https://dag.wikipedia.org/wiki/Anahi" title="Anahi – Dagbani" lang="dag" hreflang="dag" data-title="Anahi" data-language-autonym="Dagbanli" data-language-local-name="Dagbani" class="interlanguage-link-target"><span>Dagbanli</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Vier" title="Vier – 德文" lang="de" hreflang="de" data-title="Vier" data-language-autonym="Deutsch" data-language-local-name="德文" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/4_(%CE%B1%CF%81%CE%B9%CE%B8%CE%BC%CF%8C%CF%82)" title="4 (αριθμός) – 希臘文" lang="el" hreflang="el" data-title="4 (αριθμός)" data-language-autonym="Ελληνικά" data-language-local-name="希臘文" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-eml mw-list-item"><a href="https://eml.wikipedia.org/wiki/4_(n%C3%B9mer)" title="4 (nùmer) – Emiliano-Romagnolo" lang="egl" hreflang="egl" data-title="4 (nùmer)" data-language-autonym="Emiliàn e rumagnòl" data-language-local-name="Emiliano-Romagnolo" class="interlanguage-link-target"><span>Emiliàn e rumagnòl</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/4" title="4 – 英文" lang="en" hreflang="en" data-title="4" data-language-autonym="English" data-language-local-name="英文" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/4_(nombro)" title="4 (nombro) – 世界文" lang="eo" hreflang="eo" data-title="4 (nombro)" data-language-autonym="Esperanto" data-language-local-name="世界文" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Cuatro" title="Cuatro – 西班牙文" lang="es" hreflang="es" data-title="Cuatro" data-language-autonym="Español" data-language-local-name="西班牙文" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Neli" title="Neli – 愛沙尼亞文" lang="et" hreflang="et" data-title="Neli" data-language-autonym="Eesti" data-language-local-name="愛沙尼亞文" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Lau" title="Lau – 巴斯克文" lang="eu" hreflang="eu" data-title="Lau" data-language-autonym="Euskara" data-language-local-name="巴斯克文" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DB%B4" title="۴ – 波斯文" lang="fa" hreflang="fa" data-title="۴" data-language-autonym="فارسی" data-language-local-name="波斯文" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-ff mw-list-item"><a href="https://ff.wikipedia.org/wiki/Nayi" title="Nayi – 富拉文" lang="ff" hreflang="ff" data-title="Nayi" data-language-autonym="Fulfulde" data-language-local-name="富拉文" class="interlanguage-link-target"><span>Fulfulde</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/4_(luku)" title="4 (luku) – 芬蘭文" lang="fi" hreflang="fi" data-title="4 (luku)" data-language-autonym="Suomi" data-language-local-name="芬蘭文" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fj mw-list-item"><a href="https://fj.wikipedia.org/wiki/Va" title="Va – 斐濟文" lang="fj" hreflang="fj" data-title="Va" data-language-autonym="Na Vosa Vakaviti" data-language-local-name="斐濟文" class="interlanguage-link-target"><span>Na Vosa Vakaviti</span></a></li><li class="interlanguage-link interwiki-fo mw-list-item"><a href="https://fo.wikipedia.org/wiki/4_(tal)" title="4 (tal) – 法羅文" lang="fo" hreflang="fo" data-title="4 (tal)" data-language-autonym="Føroyskt" data-language-local-name="法羅文" class="interlanguage-link-target"><span>Føroyskt</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/4_(nombre)" title="4 (nombre) – 法文" lang="fr" hreflang="fr" data-title="4 (nombre)" data-language-autonym="Français" data-language-local-name="法文" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Fjouer" title="Fjouer – 北弗里西亞文" lang="frr" hreflang="frr" data-title="Fjouer" data-language-autonym="Nordfriisk" data-language-local-name="北弗里西亞文" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-fur mw-list-item"><a href="https://fur.wikipedia.org/wiki/4_(numar)" title="4 (numar) – 弗留利文" lang="fur" hreflang="fur" data-title="4 (numar)" data-language-autonym="Furlan" data-language-local-name="弗留利文" class="interlanguage-link-target"><span>Furlan</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/4_(uimhir)" title="4 (uimhir) – 愛爾蘭文" lang="ga" hreflang="ga" data-title="4 (uimhir)" data-language-autonym="Gaeilge" data-language-local-name="愛爾蘭文" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gan mw-list-item"><a href="https://gan.wikipedia.org/wiki/4" title="4 – 贛語" lang="gan" hreflang="gan" data-title="4" data-language-autonym="贛語" data-language-local-name="贛語" class="interlanguage-link-target"><span>贛語</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Catro" title="Catro – 加利西亞文" lang="gl" hreflang="gl" data-title="Catro" data-language-autonym="Galego" data-language-local-name="加利西亞文" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gn mw-list-item"><a href="https://gn.wikipedia.org/wiki/Irundy" title="Irundy – 瓜拉尼文" lang="gn" hreflang="gn" data-title="Irundy" data-language-autonym="Avañe'ẽ" data-language-local-name="瓜拉尼文" class="interlanguage-link-target"><span>Avañe'ẽ</span></a></li><li class="interlanguage-link interwiki-gor mw-list-item"><a href="https://gor.wikipedia.org/wiki/4" title="4 – 科隆達羅文" lang="gor" hreflang="gor" data-title="4" data-language-autonym="Bahasa Hulontalo" data-language-local-name="科隆達羅文" class="interlanguage-link-target"><span>Bahasa Hulontalo</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AB%AA" title="૪ – 古吉拉特文" lang="gu" hreflang="gu" data-title="૪" data-language-autonym="ગુજરાતી" data-language-local-name="古吉拉特文" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-ha mw-list-item"><a href="https://ha.wikipedia.org/wiki/4_(al%C6%99alami)" title="4 (alƙalami) – 豪薩文" lang="ha" hreflang="ha" data-title="4 (alƙalami)" data-language-autonym="Hausa" data-language-local-name="豪薩文" class="interlanguage-link-target"><span>Hausa</span></a></li><li class="interlanguage-link interwiki-hak mw-list-item"><a href="https://hak.wikipedia.org/wiki/4" title="4 – 客家話" lang="hak" hreflang="hak" data-title="4" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="客家話" class="interlanguage-link-target"><span>客家語 / Hak-kâ-ngî</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/4_(%D7%9E%D7%A1%D7%A4%D7%A8)" title="4 (מספר) – 希伯來文" lang="he" hreflang="he" data-title="4 (מספר)" data-language-autonym="עברית" data-language-local-name="希伯來文" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/%C4%8Cetiri" title="Četiri – 克羅埃西亞文" lang="hr" hreflang="hr" data-title="Četiri" data-language-autonym="Hrvatski" data-language-local-name="克羅埃西亞文" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/4_(nonm)" title="4 (nonm) – 海地文" lang="ht" hreflang="ht" data-title="4 (nonm)" data-language-autonym="Kreyòl ayisyen" data-language-local-name="海地文" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/4_(sz%C3%A1m)" title="4 (szám) – 匈牙利文" lang="hu" hreflang="hu" data-title="4 (szám)" data-language-autonym="Magyar" data-language-local-name="匈牙利文" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%89%D5%B8%D6%80%D5%BD" title="Չորս – 亞美尼亞文" lang="hy" hreflang="hy" data-title="Չորս" data-language-autonym="Հայերեն" data-language-local-name="亞美尼亞文" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/4_(numero)" title="4 (numero) – 國際文" lang="ia" hreflang="ia" data-title="4 (numero)" data-language-autonym="Interlingua" data-language-local-name="國際文" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/4_(angka)" title="4 (angka) – 印尼文" lang="id" hreflang="id" data-title="4 (angka)" data-language-autonym="Bahasa Indonesia" data-language-local-name="印尼文" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ig mw-list-item"><a href="https://ig.wikipedia.org/wiki/An%E1%BB%8D" title="Anọ – 伊布文" lang="ig" hreflang="ig" data-title="Anọ" data-language-autonym="Igbo" data-language-local-name="伊布文" class="interlanguage-link-target"><span>Igbo</span></a></li><li class="interlanguage-link interwiki-ik mw-list-item"><a href="https://ik.wikipedia.org/wiki/Sisamat" title="Sisamat – 依奴皮維克文" lang="ik" hreflang="ik" data-title="Sisamat" data-language-autonym="Iñupiatun" data-language-local-name="依奴皮維克文" class="interlanguage-link-target"><span>Iñupiatun</span></a></li><li class="interlanguage-link interwiki-inh mw-list-item"><a href="https://inh.wikipedia.org/wiki/4_(%D1%82%D0%B0%D1%8C%D1%80%D0%B0%D1%85%D1%8C)" title="4 (таьрахь) – 印古什文" lang="inh" hreflang="inh" data-title="4 (таьрахь)" data-language-autonym="ГӀалгӀай" data-language-local-name="印古什文" class="interlanguage-link-target"><span>ГӀалгӀай</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Fj%C3%B3rir" title="Fjórir – 冰島文" lang="is" hreflang="is" data-title="Fjórir" data-language-autonym="Íslenska" data-language-local-name="冰島文" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/4_(numero)" title="4 (numero) – 義大利文" lang="it" hreflang="it" data-title="4 (numero)" data-language-autonym="Italiano" data-language-local-name="義大利文" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/4" title="4 – 日文" lang="ja" hreflang="ja" data-title="4" data-language-autonym="日本語" data-language-local-name="日文" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/4_(%E1%83%A0%E1%83%98%E1%83%AA%E1%83%AE%E1%83%95%E1%83%98)" title="4 (რიცხვი) – 喬治亞文" lang="ka" hreflang="ka" data-title="4 (რიცხვი)" data-language-autonym="ქართული" data-language-local-name="喬治亞文" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kcg mw-list-item"><a href="https://kcg.wikipedia.org/wiki/4" title="4 – 卡塔布文" lang="kcg" hreflang="kcg" data-title="4" data-language-autonym="Tyap" data-language-local-name="卡塔布文" class="interlanguage-link-target"><span>Tyap</span></a></li><li class="interlanguage-link interwiki-kg mw-list-item"><a href="https://kg.wikipedia.org/wiki/4_(ntalu)" title="4 (ntalu) – 剛果文" lang="kg" hreflang="kg" data-title="4 (ntalu)" data-language-autonym="Kongo" data-language-local-name="剛果文" class="interlanguage-link-target"><span>Kongo</span></a></li><li class="interlanguage-link interwiki-kge mw-list-item"><a href="https://kge.wikipedia.org/wiki/4" title="4 – Komering" lang="kge" hreflang="kge" data-title="4" data-language-autonym="Kumoring" data-language-local-name="Komering" class="interlanguage-link-target"><span>Kumoring</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%A8%E0%B2%BE%E0%B2%B2%E0%B3%8D%E0%B2%95%E0%B3%81" title="ನಾಲ್ಕು – 坎那達文" lang="kn" hreflang="kn" data-title="ನಾಲ್ಕು" data-language-autonym="ಕನ್ನಡ" data-language-local-name="坎那達文" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/4" title="4 – 韓文" lang="ko" hreflang="ko" data-title="4" data-language-autonym="한국어" data-language-local-name="韓文" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-koi mw-list-item"><a href="https://koi.wikipedia.org/wiki/4_(%D0%BD%D1%91%D0%BB%D1%8C)" title="4 (нёль) – 科米-彼爾米亞克文" lang="koi" hreflang="koi" data-title="4 (нёль)" data-language-autonym="Перем коми" data-language-local-name="科米-彼爾米亞克文" class="interlanguage-link-target"><span>Перем коми</span></a></li><li class="interlanguage-link interwiki-ks mw-list-item"><a href="https://ks.wikipedia.org/wiki/4_(%DA%AF%D8%B1%D9%8E%D9%9B%D9%86%D9%9B%D8%AF)" title="4 (گرَٛنٛد) – 喀什米爾文" lang="ks" hreflang="ks" data-title="4 (گرَٛنٛد)" data-language-autonym="कॉशुर / کٲشُر" data-language-local-name="喀什米爾文" class="interlanguage-link-target"><span>कॉशुर / کٲشُر</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/%C3%87ar_(hejmar)" title="Çar (hejmar) – 庫德文" lang="ku" hreflang="ku" data-title="Çar (hejmar)" data-language-autonym="Kurdî" data-language-local-name="庫德文" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-kv mw-list-item"><a href="https://kv.wikipedia.org/wiki/4_(%D0%BD%D1%91%D0%BB%D1%8C)" title="4 (нёль) – 科米文" lang="kv" hreflang="kv" data-title="4 (нёль)" data-language-autonym="Коми" data-language-local-name="科米文" class="interlanguage-link-target"><span>Коми</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Quattuor" title="Quattuor – 拉丁文" lang="la" hreflang="la" data-title="Quattuor" data-language-autonym="Latina" data-language-local-name="拉丁文" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/V%C3%A9ier" title="Véier – 盧森堡文" lang="lb" hreflang="lb" data-title="Véier" data-language-autonym="Lëtzebuergesch" data-language-local-name="盧森堡文" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lbe mw-list-item"><a href="https://lbe.wikipedia.org/wiki/%D0%9C%D1%83%D0%BA%D1%8C%D0%B2%D0%B0" title="Мукьва – Lak" lang="lbe" hreflang="lbe" data-title="Мукьва" data-language-autonym="Лакку" data-language-local-name="Lak" class="interlanguage-link-target"><span>Лакку</span></a></li><li class="interlanguage-link interwiki-lg mw-list-item"><a href="https://lg.wikipedia.org/wiki/Nnya" title="Nnya – 干達文" lang="lg" hreflang="lg" data-title="Nnya" data-language-autonym="Luganda" data-language-local-name="干達文" class="interlanguage-link-target"><span>Luganda</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Veer" title="Veer – 林堡文" lang="li" hreflang="li" data-title="Veer" data-language-autonym="Limburgs" data-language-local-name="林堡文" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/N%C3%BCmar_4" title="Nümar 4 – 倫巴底文" lang="lmo" hreflang="lmo" data-title="Nümar 4" data-language-autonym="Lombard" data-language-local-name="倫巴底文" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-ln mw-list-item"><a href="https://ln.wikipedia.org/wiki/4_(motuya)" title="4 (motuya) – 林加拉文" lang="ln" hreflang="ln" data-title="4 (motuya)" data-language-autonym="Lingála" data-language-local-name="林加拉文" class="interlanguage-link-target"><span>Lingála</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/4_(skai%C4%8Dius)" title="4 (skaičius) – 立陶宛文" lang="lt" hreflang="lt" data-title="4 (skaičius)" data-language-autonym="Lietuvių" data-language-local-name="立陶宛文" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/4_(skaitlis)" title="4 (skaitlis) – 拉脫維亞文" lang="lv" hreflang="lv" data-title="4 (skaitlis)" data-language-autonym="Latviešu" data-language-local-name="拉脫維亞文" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-min mw-list-item"><a href="https://min.wikipedia.org/wiki/4_(angko)" title="4 (angko) – 米南卡堡文" lang="min" hreflang="min" data-title="4 (angko)" data-language-autonym="Minangkabau" data-language-local-name="米南卡堡文" class="interlanguage-link-target"><span>Minangkabau</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/4_(%D0%B1%D1%80%D0%BE%D1%98)" title="4 (број) – 馬其頓文" lang="mk" hreflang="mk" data-title="4 (број)" data-language-autonym="Македонски" data-language-local-name="馬其頓文" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/4_(%E0%B4%85%E0%B4%95%E0%B5%8D%E0%B4%95%E0%B4%82)" title="4 (അക്കം) – 馬來亞拉姆文" lang="ml" hreflang="ml" data-title="4 (അക്കം)" data-language-autonym="മലയാളം" data-language-local-name="馬來亞拉姆文" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mni mw-list-item"><a href="https://mni.wikipedia.org/wiki/%EA%AF%B4" title="꯴ – 曼尼普爾文" lang="mni" hreflang="mni" data-title="꯴" data-language-autonym="ꯃꯤꯇꯩ ꯂꯣꯟ" data-language-local-name="曼尼普爾文" class="interlanguage-link-target"><span>ꯃꯤꯇꯩ ꯂꯣꯟ</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A5%AA_(%E0%A4%B8%E0%A4%82%E0%A4%96%E0%A5%8D%E0%A4%AF%E0%A4%BE)" title="४ (संख्या) – 馬拉地文" lang="mr" hreflang="mr" data-title="४ (संख्या)" data-language-autonym="मराठी" data-language-local-name="馬拉地文" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/4_(nombor)" title="4 (nombor) – 馬來文" lang="ms" hreflang="ms" data-title="4 (nombor)" data-language-autonym="Bahasa Melayu" data-language-local-name="馬來文" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%81%84" title="၄ – 緬甸文" lang="my" hreflang="my" data-title="၄" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="緬甸文" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-myv mw-list-item"><a href="https://myv.wikipedia.org/wiki/4_(%D0%BB%D0%BE%D0%B2%D0%BE%D0%BC%D0%B0_%D0%B2%D0%B0%D0%BB)" title="4 (ловома вал) – 厄爾茲亞文" lang="myv" hreflang="myv" data-title="4 (ловома вал)" data-language-autonym="Эрзянь" data-language-local-name="厄爾茲亞文" class="interlanguage-link-target"><span>Эрзянь</span></a></li><li class="interlanguage-link interwiki-mzn mw-list-item"><a href="https://mzn.wikipedia.org/wiki/%DB%B4_(%D8%B9%D8%AF%D8%AF)" title="۴ (عدد) – 馬贊德蘭文" lang="mzn" hreflang="mzn" data-title="۴ (عدد)" data-language-autonym="مازِرونی" data-language-local-name="馬贊德蘭文" class="interlanguage-link-target"><span>مازِرونی</span></a></li><li class="interlanguage-link interwiki-nah mw-list-item"><a href="https://nah.wikipedia.org/wiki/Nahui" title="Nahui – Nahuatl" lang="nah" hreflang="nah" data-title="Nahui" data-language-autonym="Nāhuatl" data-language-local-name="Nahuatl" class="interlanguage-link-target"><span>Nāhuatl</span></a></li><li class="interlanguage-link interwiki-nap mw-list-item"><a href="https://nap.wikipedia.org/wiki/Quatto" title="Quatto – 拿波里文" lang="nap" hreflang="nap" data-title="Quatto" data-language-autonym="Napulitano" data-language-local-name="拿波里文" class="interlanguage-link-target"><span>Napulitano</span></a></li><li class="interlanguage-link interwiki-new mw-list-item"><a href="https://new.wikipedia.org/wiki/%E0%A5%AA" title="४ – 尼瓦爾文" lang="new" hreflang="new" data-title="४" data-language-autonym="नेपाल भाषा" data-language-local-name="尼瓦爾文" class="interlanguage-link-target"><span>नेपाल भाषा</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/4_(getal)" title="4 (getal) – 荷蘭文" lang="nl" hreflang="nl" data-title="4 (getal)" data-language-autonym="Nederlands" data-language-local-name="荷蘭文" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Talet_4" title="Talet 4 – 耐諾斯克挪威文" lang="nn" hreflang="nn" data-title="Talet 4" data-language-autonym="Norsk nynorsk" data-language-local-name="耐諾斯克挪威文" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/4_(tall)" title="4 (tall) – 巴克摩挪威文" lang="nb" hreflang="nb" data-title="4 (tall)" data-language-autonym="Norsk bokmål" data-language-local-name="巴克摩挪威文" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nso mw-list-item"><a href="https://nso.wikipedia.org/wiki/4_(nomoro)" title="4 (nomoro) – 北索托文" lang="nso" hreflang="nso" data-title="4 (nomoro)" data-language-autonym="Sesotho sa Leboa" data-language-local-name="北索托文" class="interlanguage-link-target"><span>Sesotho sa Leboa</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Afur" title="Afur – 奧羅莫文" lang="om" hreflang="om" data-title="Afur" data-language-autonym="Oromoo" data-language-local-name="奧羅莫文" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-or mw-list-item"><a href="https://or.wikipedia.org/wiki/%E0%AD%AA_(%E0%AC%B8%E0%AC%82%E0%AC%96%E0%AD%8D%E0%AD%9F%E0%AC%BE)" title="୪ (ସଂଖ୍ୟା) – 歐迪亞文" lang="or" hreflang="or" data-title="୪ (ସଂଖ୍ୟା)" data-language-autonym="ଓଡ଼ିଆ" data-language-local-name="歐迪亞文" class="interlanguage-link-target"><span>ଓଡ଼ିଆ</span></a></li><li class="interlanguage-link interwiki-pdc mw-list-item"><a href="https://pdc.wikipedia.org/wiki/Vier" title="Vier – 賓夕法尼亞德文" lang="pdc" hreflang="pdc" data-title="Vier" data-language-autonym="Deitsch" data-language-local-name="賓夕法尼亞德文" class="interlanguage-link-target"><span>Deitsch</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/4_(liczba)" title="4 (liczba) – 波蘭文" lang="pl" hreflang="pl" data-title="4 (liczba)" data-language-autonym="Polski" data-language-local-name="波蘭文" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/4" title="4 – Western Punjabi" lang="pnb" hreflang="pnb" data-title="4" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%DB%B4" title="۴ – 普什圖文" lang="ps" hreflang="ps" data-title="۴" data-language-autonym="پښتو" data-language-local-name="普什圖文" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Quatro" title="Quatro – 葡萄牙文" lang="pt" hreflang="pt" data-title="Quatro" data-language-autonym="Português" data-language-local-name="葡萄牙文" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Tawa" title="Tawa – 蓋楚瓦文" lang="qu" hreflang="qu" data-title="Tawa" data-language-autonym="Runa Simi" data-language-local-name="蓋楚瓦文" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-rn mw-list-item"><a href="https://rn.wikipedia.org/wiki/Kane" title="Kane – 隆迪文" lang="rn" hreflang="rn" data-title="Kane" data-language-autonym="Ikirundi" data-language-local-name="隆迪文" class="interlanguage-link-target"><span>Ikirundi</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/4_(cifr%C4%83)" title="4 (cifră) – 羅馬尼亞文" lang="ro" hreflang="ro" data-title="4 (cifră)" data-language-autonym="Română" data-language-local-name="羅馬尼亞文" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/4_(%D1%87%D0%B8%D1%81%D0%BB%D0%BE)" title="4 (число) – 俄文" lang="ru" hreflang="ru" data-title="4 (число)" data-language-autonym="Русский" data-language-local-name="俄文" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sat mw-list-item"><a href="https://sat.wikipedia.org/wiki/%E1%B1%94" title="᱔ – 桑塔利文" lang="sat" hreflang="sat" data-title="᱔" data-language-autonym="ᱥᱟᱱᱛᱟᱲᱤ" data-language-local-name="桑塔利文" class="interlanguage-link-target"><span>ᱥᱟᱱᱛᱟᱲᱤ</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Quattru" title="Quattru – 西西里文" lang="scn" hreflang="scn" data-title="Quattru" data-language-autonym="Sicilianu" data-language-local-name="西西里文" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/4_(broj)" title="4 (broj) – 塞爾維亞克羅埃西亞文" lang="sh" hreflang="sh" data-title="4 (broj)" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="塞爾維亞克羅埃西亞文" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-shi mw-list-item"><a href="https://shi.wikipedia.org/wiki/Kku%E1%BA%93" title="Kkuẓ – 希爾哈文" lang="shi" hreflang="shi" data-title="Kkuẓ" data-language-autonym="Taclḥit" data-language-local-name="希爾哈文" class="interlanguage-link-target"><span>Taclḥit</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/4_(number)" title="4 (number) – Simple English" lang="en-simple" hreflang="en-simple" data-title="4 (number)" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/4_(%C4%8D%C3%ADslo)" title="4 (číslo) – 斯洛伐克文" lang="sk" hreflang="sk" data-title="4 (číslo)" data-language-autonym="Slovenčina" data-language-local-name="斯洛伐克文" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/4_(%C5%A1tevilo)" title="4 (število) – 斯洛維尼亞文" lang="sl" hreflang="sl" data-title="4 (število)" data-language-autonym="Slovenščina" data-language-local-name="斯洛維尼亞文" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sm mw-list-item"><a href="https://sm.wikipedia.org/wiki/Fa_(numera)" title="Fa (numera) – 薩摩亞文" lang="sm" hreflang="sm" data-title="Fa (numera)" data-language-autonym="Gagana Samoa" data-language-local-name="薩摩亞文" class="interlanguage-link-target"><span>Gagana Samoa</span></a></li><li class="interlanguage-link interwiki-sn mw-list-item"><a href="https://sn.wikipedia.org/wiki/Ina" title="Ina – 紹納文" lang="sn" hreflang="sn" data-title="Ina" data-language-autonym="ChiShona" data-language-local-name="紹納文" class="interlanguage-link-target"><span>ChiShona</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/4_(tiro)" title="4 (tiro) – 索馬利文" lang="so" hreflang="so" data-title="4 (tiro)" data-language-autonym="Soomaaliga" data-language-local-name="索馬利文" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Kat%C3%ABr_(4)" title="Katër (4) – 阿爾巴尼亞文" lang="sq" hreflang="sq" data-title="Katër (4)" data-language-autonym="Shqip" data-language-local-name="阿爾巴尼亞文" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/4_(%D0%B1%D1%80%D0%BE%D1%98)" title="4 (број) – 塞爾維亞文" lang="sr" hreflang="sr" data-title="4 (број)" data-language-autonym="Српски / srpski" data-language-local-name="塞爾維亞文" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-srn mw-list-item"><a href="https://srn.wikipedia.org/wiki/Numro_4" title="Numro 4 – 蘇拉南東墎文" lang="srn" hreflang="srn" data-title="Numro 4" data-language-autonym="Sranantongo" data-language-local-name="蘇拉南東墎文" class="interlanguage-link-target"><span>Sranantongo</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/4_(tal)" title="4 (tal) – 瑞典文" lang="sv" hreflang="sv" data-title="4 (tal)" data-language-autonym="Svenska" data-language-local-name="瑞典文" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Nne" title="Nne – 史瓦希里文" lang="sw" hreflang="sw" data-title="Nne" data-language-autonym="Kiswahili" data-language-local-name="史瓦希里文" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-szl mw-list-item"><a href="https://szl.wikipedia.org/wiki/4_(n%C5%AFmera)" title="4 (nůmera) – 西利西亞文" lang="szl" hreflang="szl" data-title="4 (nůmera)" data-language-autonym="Ślůnski" data-language-local-name="西利西亞文" class="interlanguage-link-target"><span>Ślůnski</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/4_(%E0%AE%8E%E0%AE%A3%E0%AF%8D)" title="4 (எண்) – 坦米爾文" lang="ta" hreflang="ta" data-title="4 (எண்)" data-language-autonym="தமிழ்" data-language-local-name="坦米爾文" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%A8%E0%B0%BE%E0%B0%B2%E0%B1%81%E0%B0%97%E0%B1%81" title="నాలుగు – 泰盧固文" lang="te" hreflang="te" data-title="నాలుగు" data-language-autonym="తెలుగు" data-language-local-name="泰盧固文" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/4" title="4 – 泰文" lang="th" hreflang="th" data-title="4" data-language-autonym="ไทย" data-language-local-name="泰文" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-ti mw-list-item"><a href="https://ti.wikipedia.org/wiki/%E1%8A%A3%E1%88%AD%E1%89%A3%E1%8B%95%E1%89%B0" title="ኣርባዕተ – 提格利尼亞文" lang="ti" hreflang="ti" data-title="ኣርባዕተ" data-language-autonym="ትግርኛ" data-language-local-name="提格利尼亞文" class="interlanguage-link-target"><span>ትግርኛ</span></a></li><li class="interlanguage-link interwiki-tk mw-list-item"><a href="https://tk.wikipedia.org/wiki/4_(san)" title="4 (san) – 土庫曼文" lang="tk" hreflang="tk" data-title="4 (san)" data-language-autonym="Türkmençe" data-language-local-name="土庫曼文" class="interlanguage-link-target"><span>Türkmençe</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/4_(bilang)" title="4 (bilang) – 塔加路族文" lang="tl" hreflang="tl" data-title="4 (bilang)" data-language-autonym="Tagalog" data-language-local-name="塔加路族文" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/4_(say%C4%B1)" title="4 (sayı) – 土耳其文" lang="tr" hreflang="tr" data-title="4 (sayı)" data-language-autonym="Türkçe" data-language-local-name="土耳其文" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-ts mw-list-item"><a href="https://ts.wikipedia.org/wiki/Mune" title="Mune – 特松加文" lang="ts" hreflang="ts" data-title="Mune" data-language-autonym="Xitsonga" data-language-local-name="特松加文" class="interlanguage-link-target"><span>Xitsonga</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/4_(%D1%81%D0%B0%D0%BD)" title="4 (сан) – 韃靼文" lang="tt" hreflang="tt" data-title="4 (сан)" data-language-autonym="Татарча / tatarça" data-language-local-name="韃靼文" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-tum mw-list-item"><a href="https://tum.wikipedia.org/wiki/Vinayi" title="Vinayi – 圖姆布卡文" lang="tum" hreflang="tum" data-title="Vinayi" data-language-autonym="ChiTumbuka" data-language-local-name="圖姆布卡文" class="interlanguage-link-target"><span>ChiTumbuka</span></a></li><li class="interlanguage-link interwiki-tyv mw-list-item"><a href="https://tyv.wikipedia.org/wiki/4" title="4 – 圖瓦文" lang="tyv" hreflang="tyv" data-title="4" data-language-autonym="Тыва дыл" data-language-local-name="圖瓦文" class="interlanguage-link-target"><span>Тыва дыл</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/4_(%D1%87%D0%B8%D1%81%D0%BB%D0%BE)" title="4 (число) – 烏克蘭文" lang="uk" hreflang="uk" data-title="4 (число)" data-language-autonym="Українська" data-language-local-name="烏克蘭文" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/4_(%D8%B9%D8%AF%D8%AF)" title="4 (عدد) – 烏都文" lang="ur" hreflang="ur" data-title="4 (عدد)" data-language-autonym="اردو" data-language-local-name="烏都文" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/4_(son)" title="4 (son) – 烏茲別克文" lang="uz" hreflang="uz" data-title="4 (son)" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="烏茲別克文" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-ve mw-list-item"><a href="https://ve.wikipedia.org/wiki/Ina" title="Ina – 溫達文" lang="ve" hreflang="ve" data-title="Ina" data-language-autonym="Tshivenda" data-language-local-name="溫達文" class="interlanguage-link-target"><span>Tshivenda</span></a></li><li class="interlanguage-link interwiki-vep mw-list-item"><a href="https://vep.wikipedia.org/wiki/4_(lugu)" title="4 (lugu) – 維普森文" lang="vep" hreflang="vep" data-title="4 (lugu)" data-language-autonym="Vepsän kel’" data-language-local-name="維普森文" class="interlanguage-link-target"><span>Vepsän kel’</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/4_(s%E1%BB%91)" title="4 (số) – 越南文" lang="vi" hreflang="vi" data-title="4 (số)" data-language-autonym="Tiếng Việt" data-language-local-name="越南文" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-vls mw-list-item"><a href="https://vls.wikipedia.org/wiki/4_(getal)" title="4 (getal) – 西佛蘭德文" lang="vls" hreflang="vls" data-title="4 (getal)" data-language-autonym="West-Vlams" data-language-local-name="西佛蘭德文" class="interlanguage-link-target"><span>West-Vlams</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/4_(ihap)" title="4 (ihap) – 瓦瑞文" lang="war" hreflang="war" data-title="4 (ihap)" data-language-autonym="Winaray" data-language-local-name="瓦瑞文" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wo mw-list-item"><a href="https://wo.wikipedia.org/wiki/%C3%91ent" title="Ñent – 沃洛夫文" lang="wo" hreflang="wo" data-title="Ñent" data-language-autonym="Wolof" data-language-local-name="沃洛夫文" class="interlanguage-link-target"><span>Wolof</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/4" title="4 – 吳語" lang="wuu" hreflang="wuu" data-title="4" data-language-autonym="吴语" data-language-local-name="吳語" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-xal mw-list-item"><a href="https://xal.wikipedia.org/wiki/4" title="4 – 卡爾梅克文" lang="xal" hreflang="xal" data-title="4" data-language-autonym="Хальмг" data-language-local-name="卡爾梅克文" class="interlanguage-link-target"><span>Хальмг</span></a></li><li class="interlanguage-link interwiki-xh mw-list-item"><a href="https://xh.wikipedia.org/wiki/Zine" title="Zine – 科薩文" lang="xh" hreflang="xh" data-title="Zine" data-language-autonym="IsiXhosa" data-language-local-name="科薩文" class="interlanguage-link-target"><span>IsiXhosa</span></a></li><li class="interlanguage-link interwiki-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/%E1%83%9D%E1%83%97%E1%83%AE%E1%83%98" title="ოთხი – 明格列爾文" lang="xmf" hreflang="xmf" data-title="ოთხი" data-language-autonym="მარგალური" data-language-local-name="明格列爾文" class="interlanguage-link-target"><span>მარგალური</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/4_(%D7%A0%D7%95%D7%9E%D7%A2%D7%A8)" title="4 (נומער) – 意第緒文" lang="yi" hreflang="yi" data-title="4 (נומער)" data-language-autonym="ייִדיש" data-language-local-name="意第緒文" class="interlanguage-link-target"><span>ייִדיש</span></a></li><li class="interlanguage-link interwiki-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/4_(n%E1%BB%8D%CC%81mb%C3%A0)" title="4 (nọ́mbà) – 約魯巴文" lang="yo" hreflang="yo" data-title="4 (nọ́mbà)" data-language-autonym="Yorùbá" data-language-local-name="約魯巴文" class="interlanguage-link-target"><span>Yorùbá</span></a></li><li class="interlanguage-link interwiki-za mw-list-item"><a href="https://za.wikipedia.org/wiki/4" title="4 – 壯文" lang="za" hreflang="za" data-title="4" data-language-autonym="Vahcuengh" 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href="/w/index.php?title=%E7%89%B9%E6%AE%8A:DownloadAsPdf&page=%E5%9B%9B&action=show-download-screen"><span>存為PDF檔</span></a></li><li id="t-print" class="mw-list-item"><a href="javascript:print();" rel="alternate" title="備印墨，整版貌[p]" accesskey="p"><span>付梓</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> 諸策 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:4_(number)" hreflang="en"><span>維基共享</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q202" title="連結至已連接的資料儲存庫項目[g]" accesskey="g"><span>維基數據項</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="頁面工具"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="外觀"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">外觀</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">移至側邊欄</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">隱藏</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> <div id="mw-indicator-indicator-fr-review-status" class="mw-indicator"><indicator name="fr-review-status" class="mw-fr-review-status-indicator" id="mw-fr-revision-toggle"><span class="cdx-fr-css-icon-review--status--unchecked"></span><b><a href="/wiki/%E8%AA%AA%E6%98%8E:%E6%A0%A1%E5%B0%8D" title="說明:校對">今本</a></b>（此為底本，未經審校）</indicator></div> </div> <div id="siteSub" class="noprint">文出維基大典</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div id="mw-fr-revision-details" class="mw-fr-revision-details-dialog" style="display:none;"><div tabindex="0"></div><div class="cdx-dialog cdx-dialog--horizontal-actions"><header class="cdx-dialog__header cdx-dialog__header--default"><div class="cdx-dialog__header__title-group"><h2 class="cdx-dialog__header__title">頁面版本狀態</h2><p class="cdx-dialog__header__subtitle">該頁面尚未檢查</p></div><button class="cdx-button cdx-button--action-default cdx-button--weight-quiet
							cdx-button--size-medium cdx-button--icon-only cdx-dialog__header__close-button" aria-label="關閉" onclick="document.getElementById("mw-fr-revision-details").style.display = "none";" type="submit"><span class="cdx-icon cdx-icon--medium
							cdx-fr-css-icon--close"></span></button></header><div class="cdx-dialog__body">此為底本，未經<a href="/wiki/%E8%AA%AA%E6%98%8E:%E6%A0%A1%E5%B0%8D" title="說明:校對">審校</a>。</div></div><div tabindex="0"></div></div><div class="mw-content-ltr mw-parser-output" lang="lzh" dir="ltr"><div style="border:1px solid #A3B1BF; padding:0.5em 2em; width:60%; float:left;"> 註︰蓋當今數學之事，誠難僅以文述，而無符號，故凡數學之文，咸有漢字、拉丁字相易之事，以合文言、數學，則無論文理之人，皆可明之也。</div> <div style="clear:left;"></div> <p><b>四</b>者，<a href="/wiki/%E6%95%B4%E6%95%B8" title="整數">整數</a>也。其前接者為<a href="/wiki/%E4%B8%89" title="三">三</a>，後續者為<a href="/wiki/%E4%BA%94" title="五">五</a>。嘗書<b>亖</b>，今可書<b>肆</b>。 </p> <div class="mw-heading mw-heading2"><h2 id="數"><span id=".E6.95.B8"></span>數</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%9B%9B&action=edit&section=1" title="所纂章名：數"><span>纂</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>四者，<a href="/wiki/%E5%90%88%E6%95%B8" title="合數">合數</a>之首也，其因數有<a href="/wiki/%E4%B8%80" title="一">一</a>，<a href="/wiki/%E4%BA%8C" title="二">二</a>，<b>四</b>。<a href="/w/index.php?title=%E8%B3%AA%E5%9B%A0%E6%95%B8%E5%88%86%E8%A7%A3&action=edit&redlink=1" class="new" title="質因數分解（查無此頁）">質因數分解</a>為二之二<a href="/w/index.php?title=%E4%B9%98%E6%96%B9&action=edit&redlink=1" class="new" title="乘方（查無此頁）">乘方</a>（<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 2^{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msup> <mn>2</mn> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 2^{2}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/efd7711cd907a2d46557a410fb67fc0d84c52ba3" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:2.217ex; height:2.676ex;" alt="{\displaystyle 2^{2}}"></span>）。</li> <li>四者，<a href="/w/index.php?title=%E8%99%A7%E6%95%B8&action=edit&redlink=1" class="new" title="虧數（查無此頁）">虧數</a>之第四也，<a href="/w/index.php?title=%E7%9C%9F%E5%9B%A0%E6%95%B8%E5%92%8C&action=edit&redlink=1" class="new" title="真因數和（查無此頁）">真因數和</a>為3，<a href="/w/index.php?title=%E8%99%A7%E5%BA%A6&action=edit&redlink=1" class="new" title="虧度（查無此頁）">虧度</a>為1。其前接者為<a href="/wiki/%E4%B8%89" title="三">三</a>，後續者為<a href="/wiki/%E4%BA%94" title="五">五</a>。</li> <li>四者，<a href="/w/index.php?title=%E9%AB%98%E5%90%88%E6%88%90%E6%95%B8&action=edit&redlink=1" class="new" title="高合成數（查無此頁）">高合成數</a>之第三也。其前接者為<a href="/wiki/%E4%BA%8C" title="二">二</a>，後續者為<a href="/wiki/%E5%85%AD" title="六">六</a>。</li> <li>四者，<a href="/w/index.php?title=%E5%8D%8A%E8%B3%AA%E6%95%B8&action=edit&redlink=1" class="new" title="半質數（查無此頁）">半質數</a>之首也。其後續者為六。</li> <li>四者，<a href="/wiki/%E5%B9%B3%E6%96%B9%E6%95%B8" title="平方數">平方數</a>之第二也，為<a href="/wiki/%E4%BA%8C" title="二">二</a>之平方也。其前接者為<a href="/wiki/%E4%B8%80" title="一">一</a>，後續者為<a href="/wiki/%E4%B9%9D" title="九">九</a>。</li> <li>四者，<a href="/wiki/%E5%8D%81%E9%80%B2%E5%88%B6" title="十進制">十進制</a>中<a href="/w/index.php?title=%E5%93%88%E6%B2%99%E5%BE%B7%E6%95%B8&action=edit&redlink=1" class="new" title="哈沙德數（查無此頁）">哈沙德數</a>之首也。其前接者為三，後續者為五。 <ul><li>四者，<a href="/w/index.php?title=%E5%85%A8%E5%93%88%E6%B2%99%E5%BE%B7%E6%95%B8&action=edit&redlink=1" class="new" title="全哈沙德數（查無此頁）">全哈沙德數</a>之第三也。其前接者為二，後續者為六。</li></ul></li> <li>四者，<a href="/wiki/%E5%8D%81%E9%80%B2%E5%88%B6" title="十進制">十進制</a>中<a href="/w/index.php?title=%E5%A5%A2%E4%BE%88%E6%95%B8&action=edit&redlink=1" class="new" title="奢侈數（查無此頁）">奢侈數</a>之首也。其後續者為六。</li> <li>四者，<a href="/wiki/%E5%8D%81%E9%80%B2%E5%88%B6" title="十進制">十進制</a>中<a href="/w/index.php?title=%E5%8F%B2%E5%AF%86%E5%A4%AB%E6%95%B8&action=edit&redlink=1" class="new" title="史密夫數（查無此頁）">史密夫數</a>之首也。其後續者為<a href="/w/index.php?title=%E5%BB%BF%E4%BA%8C&action=edit&redlink=1" class="new" title="廿二（查無此頁）">廿二</a>。</li> <li><a href="/wiki/%E6%AD%A3%E6%96%B9%E5%BD%A2" title="正方形">正方形</a>者，<a href="/w/index.php?title=%E5%8F%AF%E4%BD%9C%E5%9C%96%E5%A4%9A%E9%82%8A%E5%BD%A2&action=edit&redlink=1" class="new" title="可作圖多邊形（查無此頁）">可作圖多邊形</a>之第二也。其前接者為<a href="/wiki/%E4%B8%89%E8%A7%92%E5%BD%A2" title="三角形">三角形</a>，後續者為<a href="/w/index.php?title=%E4%BA%94%E9%82%8A%E5%BD%A2&action=edit&redlink=1" class="new" title="五邊形（查無此頁）">五邊形</a>。</li> <li>四者，非一<a href="/wiki/%E5%9B%A0%E6%95%B8" title="因數">因數</a>皆為<a href="/wiki/%E8%B3%AA%E6%95%B8" title="質數">質數</a>加一者之第二也。其前接者為<a href="/wiki/%E4%B8%89" title="三">三</a>，後續者為<a href="/wiki/%E5%85%AD" title="六">六</a>。</li> <li>四者，<a href="/w/index.php?title=%E5%9B%9B%E9%9D%A2%E9%AB%94%E6%95%B8&action=edit&redlink=1" class="new" title="四面體數（查無此頁）">四面體數</a>也。</li> <li>四者，<a href="/w/index.php?title=%E4%B8%AD%E5%BF%83%E4%B8%89%E8%A7%92%E5%BD%A2%E6%95%B8&action=edit&redlink=1" class="new" title="中心三角形數（查無此頁）">中心三角形數</a>也。</li> <li>二加二為四，二乘二與二之二乘方亦然（<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 2+2=2*2=2^{2}=4}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>2</mn> <mo>+</mo> <mn>2</mn> <mo>=</mo> <mn>2</mn> <mo>∗</mo> <mn>2</mn> <mo>=</mo> <msup> <mn>2</mn> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>=</mo> <mn>4</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 2+2=2*2=2^{2}=4}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/fbf19605a9a21fcb3d4dbfcc1ac66320b9d878b3" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:22.359ex; height:2.843ex;" alt="{\displaystyle 2+2=2*2=2^{2}=4}"></span>）。</li> <li>四者，<a href="/w/index.php?title=%E9%9D%9E%E6%96%90%E6%B3%A2%E9%82%A3%E5%A5%91%E6%95%B8&action=edit&redlink=1" class="new" title="非斐波那契數（查無此頁）">非斐波那契數</a>之首也。</li> <li>凡四之倍數皆為兩平方數之差。凡數乘四皆為二以斯數加一之和次方加二以斯數減一之差次方。（<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 4x=(x+1)^{2}-(x-1)^{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>4</mn> <mi>x</mi> <mo>=</mo> <mo stretchy="false">(</mo> <mi>x</mi> <mo>+</mo> <mn>1</mn> <msup> <mo stretchy="false">)</mo> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>−</mo> <mo stretchy="false">(</mo> <mi>x</mi> <mo>−</mo> <mn>1</mn> <msup> <mo stretchy="false">)</mo> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 4x=(x+1)^{2}-(x-1)^{2}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b565efe662ff3dd2de34bee7ce0a46c87c847231" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:24.823ex; height:3.176ex;" alt="{\displaystyle 4x=(x+1)^{2}-(x-1)^{2}}"></span>）</li> <li>凡四連自然數相乘加一皆為平方數。凡數加一之和、斯數加二之和、斯數加三之和與斯數四二之和相乘皆為二以斯數之二次方、斯數乘三與一之和次方。（<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle x(x+1)(x+2)(x+3)+1=(x^{2}+3x+1)^{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>x</mi> <mo stretchy="false">(</mo> <mi>x</mi> <mo>+</mo> <mn>1</mn> <mo stretchy="false">)</mo> <mo stretchy="false">(</mo> <mi>x</mi> <mo>+</mo> <mn>2</mn> <mo stretchy="false">)</mo> <mo stretchy="false">(</mo> <mi>x</mi> <mo>+</mo> <mn>3</mn> <mo stretchy="false">)</mo> <mo>+</mo> <mn>1</mn> <mo>=</mo> <mo stretchy="false">(</mo> <msup> <mi>x</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>+</mo> <mn>3</mn> <mi>x</mi> <mo>+</mo> <mn>1</mn> <msup> <mo stretchy="false">)</mo> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle x(x+1)(x+2)(x+3)+1=(x^{2}+3x+1)^{2}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/df0b7543fcaee09b0aa72a8caf8ac259ccb62943" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:44.439ex; height:3.176ex;" alt="{\displaystyle x(x+1)(x+2)(x+3)+1=(x^{2}+3x+1)^{2}}"></span>）</li> <li>有<a href="/w/index.php?title=%E5%9B%9B%E5%B9%B3%E6%96%B9%E5%92%8C%E5%AE%9A%E7%90%86&action=edit&redlink=1" class="new" title="四平方和定理（查無此頁）">四平方和定理</a>曰：凡自然數皆可為至多四<a href="/wiki/%E5%B9%B3%E6%96%B9%E6%95%B8" title="平方數">平方數</a>之和。</li> <li><a href="/w/index.php?title=%E6%95%B4%E5%9B%9B%E9%9D%A2%E9%AB%94&action=edit&redlink=1" class="new" title="整四面體（查無此頁）">整四面體</a>者，<a href="/w/index.php?title=%E6%9F%8F%E6%8B%89%E5%9C%96%E7%AB%8B%E9%AB%94&action=edit&redlink=1" class="new" title="柏拉圖立體（查無此頁）">柏拉圖立體</a>之首也。</li> <li>有<a href="/w/index.php?title=%E5%9B%9B%E8%89%B2%E5%AE%9A%E7%90%86&action=edit&redlink=1" class="new" title="四色定理（查無此頁）">四色定理</a>曰：若有一輿圖，必可用四色填之而鄰國不同色。</li> <li>加減乘除統稱<a href="/w/index.php?title=%E5%9B%9B%E5%89%87%E9%81%8B%E7%AE%97&action=edit&redlink=1" class="new" title="四則運算（查無此頁）">四則運算</a>。</li> <li>第四級<a href="/w/index.php?title=%E8%B6%85%E9%81%8B%E7%AE%97&action=edit&redlink=1" class="new" title="超運算（查無此頁）">超運算</a>為<a href="/w/index.php?title=%E8%BF%AD%E4%BB%A3%E5%86%AA%E6%AC%A1&action=edit&redlink=1" class="new" title="迭代冪次（查無此頁）">迭代冪次</a></li> <li>有<a href="/w/index.php?title=%E6%95%B8%E6%88%B2&action=edit&redlink=1" class="new" title="數戲（查無此頁）">數戲</a>名曰<a href="/w/index.php?title=%E5%9B%9B%E5%9B%9B&action=edit&redlink=1" class="new" title="四四（查無此頁）">四四</a>。</li></ul></div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">取自「<a dir="ltr" href="https://zh-classical.wikipedia.org/wiki/四">https://zh-classical.wikipedia.org/wiki/四</a>」</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/%E7%89%B9%E6%AE%8A:%E9%A1%9E" title="特殊:類">一類</a>：<ul><li><a href="/wiki/%E5%88%86%E9%A1%9E:%E6%95%B4%E6%95%B8" title="分類:整數">整數</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-copyright">凡我維基之文，悉為<a rel="nofollow" class="external text" href="//creativecommons.org/licenses/by-sa/4.0/">共享創意授權</a>。翻印增刪，皆須引據，並同道為之。然條款繁多，不一而足。請閱<a class="external text" href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use">全文</a>，以得其詳。<br /></li> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">隱私通例</a></li> <li id="footer-places-about"><a href="/wiki/%E6%96%87%E8%A8%80%E7%B6%AD%E5%9F%BA%E5%A4%A7%E5%85%B8">大典自序</a></li> <li id="footer-places-disclaimers"><a href="https://en.wikipedia.org/wiki/Wikipedia:General_disclaimer">免責告示</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">行為準則</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">司空津逮</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/zh-classical.wikipedia.org">彙統</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">鑑識聲明</a></li> <li id="footer-places-mobileview"><a href="//zh-classical.m.wikipedia.org/w/index.php?title=%E5%9B%9B&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">掌中書卷</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-6d94db5ff4-krlvt","wgBackendResponseTime":171,"wgPageParseReport":{"limitreport":{"cputime":"0.014","walltime":"0.067","ppvisitednodes":{"value":23,"limit":1000000},"postexpandincludesize":{"value":312,"limit":2097152},"templateargumentsize":{"value":0,"limit":2097152},"expansiondepth":{"value":2,"limit":100},"expensivefunctioncount":{"value":0,"limit":500},"unstrip-depth":{"value":0,"limit":20},"unstrip-size":{"value":144,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 2.183 1 模板:當代數學","100.00% 2.183 1 -total"]},"cachereport":{"origin":"mw-web.codfw.main-8474f6489c-xr647","timestamp":"20241126220633","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"\u56db","url":"https:\/\/zh-classical.wikipedia.org\/wiki\/%E5%9B%9B","sameAs":"http:\/\/www.wikidata.org\/entity\/Q202","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q202","author":{"@type":"Organization","name":"\u7dad\u57fa\u5a92\u9ad4\u5c08\u6848\u8ca2\u737b\u8005"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2022-02-18T01:48:38Z","headline":"\u81ea\u7136\u6578"}</script> </body> </html>