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Disponibile in 39 lingue" > <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-39" 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">39 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%87%D9%86%D8%AF%D8%B3%D8%A9_%D8%B1%D9%8A%D9%85%D8%A7%D9%86%D9%8A%D8%A9" title="هندسة ريمانية - arabo" lang="ar" hreflang="ar" data-title="هندسة ريمانية" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Xeometr%C3%ADa_de_Riemann" title="Xeometría de Riemann - asturiano" lang="ast" hreflang="ast" data-title="Xeometría de Riemann" data-language-autonym="Asturianu" data-language-local-name="asturiano" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Riman_h%C9%99nd%C9%99s%C9%99si" title="Riman həndəsəsi - azerbaigiano" lang="az" hreflang="az" data-title="Riman həndəsəsi" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaigiano" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A0%D0%B8%D0%BC%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0_%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F" title="Риманова геометрия - bulgaro" lang="bg" hreflang="bg" data-title="Риманова геометрия" data-language-autonym="Български" data-language-local-name="bulgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Geometria_riemanniana" title="Geometria riemanniana - catalano" lang="ca" hreflang="ca" data-title="Geometria riemanniana" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Riemannova_geometrie" title="Riemannova geometrie - ceco" lang="cs" hreflang="cs" data-title="Riemannova geometrie" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%A0%D0%B8%D0%BC%D0%B0%D0%BD_%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D0%B9%C4%95" title="Риман геометрийĕ - ciuvascio" lang="cv" hreflang="cv" data-title="Риман геометрийĕ" data-language-autonym="Чӑвашла" data-language-local-name="ciuvascio" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Riemannsk_geometri" title="Riemannsk geometri - danese" lang="da" hreflang="da" data-title="Riemannsk geometri" data-language-autonym="Dansk" data-language-local-name="danese" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Riemannsche_Geometrie" title="Riemannsche Geometrie - tedesco" lang="de" hreflang="de" data-title="Riemannsche Geometrie" data-language-autonym="Deutsch" data-language-local-name="tedesco" 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/%CE%A1%CE%B9%CE%BC%CE%AC%CE%BD%CE%B5%CE%B9%CE%B1_%CE%B3%CE%B5%CF%89%CE%BC%CE%B5%CF%84%CF%81%CE%AF%CE%B1" title="Ριμάνεια γεωμετρία - greco" lang="el" hreflang="el" data-title="Ριμάνεια γεωμετρία" data-language-autonym="Ελληνικά" data-language-local-name="greco" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Riemannian_geometry" title="Riemannian geometry - inglese" lang="en" hreflang="en" data-title="Riemannian geometry" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Geometr%C3%ADa_de_Riemann" title="Geometría de Riemann - spagnolo" lang="es" hreflang="es" data-title="Geometría de Riemann" data-language-autonym="Español" data-language-local-name="spagnolo" 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/Riemanni_geomeetria" title="Riemanni geomeetria - estone" lang="et" hreflang="et" data-title="Riemanni geomeetria" data-language-autonym="Eesti" data-language-local-name="estone" 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/Riemannen_geometria" title="Riemannen geometria - basco" lang="eu" hreflang="eu" data-title="Riemannen geometria" data-language-autonym="Euskara" data-language-local-name="basco" 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/%D9%87%D9%86%D8%AF%D8%B3%D9%87_%D8%B1%DB%8C%D9%85%D8%A7%D9%86%DB%8C" title="هندسه ریمانی - persiano" lang="fa" hreflang="fa" data-title="هندسه ریمانی" data-language-autonym="فارسی" data-language-local-name="persiano" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Riemannin_geometria" title="Riemannin geometria - finlandese" lang="fi" hreflang="fi" data-title="Riemannin geometria" data-language-autonym="Suomi" data-language-local-name="finlandese" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/G%C3%A9om%C3%A9trie_riemannienne" title="Géométrie riemannienne - francese" lang="fr" hreflang="fr" data-title="Géométrie riemannienne" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Xeometr%C3%ADa_de_Riemann" title="Xeometría de Riemann - galiziano" lang="gl" hreflang="gl" data-title="Xeometría de Riemann" data-language-autonym="Galego" data-language-local-name="galiziano" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B0%E0%A5%80%E0%A4%AE%E0%A4%BE%E0%A4%A8%E0%A5%80_%E0%A4%9C%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AE%E0%A4%BF%E0%A4%A4%E0%A4%BF" title="रीमानी ज्यामिति - hindi" lang="hi" hreflang="hi" data-title="रीमानी ज्यामिति" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8C%D5%AB%D5%B4%D5%A1%D5%B6%D5%B5%D5%A1%D5%B6_%D5%A5%D6%80%D5%AF%D6%80%D5%A1%D5%B9%D5%A1%D6%83%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Ռիմանյան երկրաչափություն - armeno" lang="hy" hreflang="hy" data-title="Ռիմանյան երկրաչափություն" data-language-autonym="Հայերեն" data-language-local-name="armeno" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Geometri_Riemann" title="Geometri Riemann - indonesiano" lang="id" hreflang="id" data-title="Geometri Riemann" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%AA%E3%83%BC%E3%83%9E%E3%83%B3%E5%B9%BE%E4%BD%95%E5%AD%A6" title="リーマン幾何学 - giapponese" lang="ja" hreflang="ja" data-title="リーマン幾何学" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A0%D0%B8%D0%BC%D0%B0%D0%BD_%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F%D1%81%D1%8B" title="Риман геометриясы - kazako" lang="kk" hreflang="kk" data-title="Риман геометриясы" data-language-autonym="Қазақша" data-language-local-name="kazako" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%A6%AC%EB%A7%8C_%EA%B8%B0%ED%95%98%ED%95%99" title="리만 기하학 - coreano" lang="ko" hreflang="ko" data-title="리만 기하학" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Riemann-meetkunde" title="Riemann-meetkunde - olandese" lang="nl" hreflang="nl" data-title="Riemann-meetkunde" data-language-autonym="Nederlands" data-language-local-name="olandese" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Riemanns_differensialgeometri" title="Riemanns differensialgeometri - norvegese bokmål" lang="nb" hreflang="nb" data-title="Riemanns differensialgeometri" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%B0%E0%A9%80%E0%A8%AE%E0%A8%BE%E0%A8%A8%E0%A9%80%E0%A8%85%E0%A8%A8_%E0%A8%9C%E0%A9%80%E0%A8%93%E0%A8%AE%E0%A9%88%E0%A8%9F%E0%A9%8D%E0%A8%B0%E0%A9%80" title="ਰੀਮਾਨੀਅਨ ਜੀਓਮੈਟ੍ਰੀ - punjabi" lang="pa" hreflang="pa" data-title="ਰੀਮਾਨੀਅਨ ਜੀਓਮੈਟ੍ਰੀ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Geometria_de_Riemann" title="Geometria de Riemann - portoghese" lang="pt" hreflang="pt" data-title="Geometria de Riemann" data-language-autonym="Português" data-language-local-name="portoghese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A0%D0%B8%D0%BC%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0_%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F" title="Риманова геометрия - russo" lang="ru" hreflang="ru" data-title="Риманова геометрия" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Riemannova_geometrija" title="Riemannova geometrija - serbo-croato" lang="sh" hreflang="sh" data-title="Riemannova geometrija" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbo-croato" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Rimanova_geometrija" title="Rimanova geometrija - serbo" lang="sr" hreflang="sr" data-title="Rimanova geometrija" data-language-autonym="Српски / srpski" data-language-local-name="serbo" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Riemanngeometri" title="Riemanngeometri - svedese" lang="sv" hreflang="sv" data-title="Riemanngeometri" data-language-autonym="Svenska" data-language-local-name="svedese" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Heometriyang_Riemanniano" title="Heometriyang Riemanniano - tagalog" lang="tl" hreflang="tl" data-title="Heometriyang Riemanniano" data-language-autonym="Tagalog" data-language-local-name="tagalog" 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/Riemann_geometrisi" title="Riemann geometrisi - turco" lang="tr" hreflang="tr" data-title="Riemann geometrisi" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A0%D1%96%D0%BC%D0%B0%D0%BD%D0%BE%D0%B2%D0%B0_%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D1%96%D1%8F" title="Ріманова геометрія - ucraino" lang="uk" hreflang="uk" data-title="Ріманова геометрія" data-language-autonym="Українська" data-language-local-name="ucraino" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Riemann_geometriyasi" title="Riemann geometriyasi - uzbeco" lang="uz" hreflang="uz" data-title="Riemann geometriyasi" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="uzbeco" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/H%C3%ACnh_h%E1%BB%8Dc_Riemann" title="Hình học Riemann - vietnamita" lang="vi" hreflang="vi" data-title="Hình học Riemann" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E9%BB%8E%E6%9B%BC%E5%87%A0%E4%BD%95" title="黎曼几何 - cinese" lang="zh" hreflang="zh" data-title="黎曼几何" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E9%BB%8E%E6%9B%BC%E5%B9%BE%E4%BD%95" title="黎曼幾何 - cantonese" lang="yue" hreflang="yue" data-title="黎曼幾何" data-language-autonym="粵語" data-language-local-name="cantonese" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q761383#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div 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</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> <div id="siteSub" class="noprint">Da Wikipedia, l'enciclopedia libera.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="it" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r133964453">.mw-parser-output .avviso .mbox-text-div>div,.mw-parser-output .avviso .mbox-text-full-div>div{font-size:90%}.mw-parser-output .avviso .mbox-image{flex-basis:52px;flex-grow:0;flex-shrink:0}.mw-parser-output .avviso .mbox-text-full-div .hide-when-compact{display:block}</style><div style="" class="ambox metadata noprint plainlinks avviso avviso-generico"> <div class="avviso-immagine mbox-image noprint"><span typeof="mw:File"><a href="/wiki/File:Cube.svg" class="mw-file-description" title="Abbozzo geometria"><img alt="Abbozzo geometria" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/02/Cube.svg/45px-Cube.svg.png" decoding="async" width="45" height="41" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/02/Cube.svg/68px-Cube.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/02/Cube.svg/90px-Cube.svg.png 2x" data-file-width="335" data-file-height="308" /></a></span></div> <div class="avviso-testo mbox-text"> <div class="mbox-text-div"><b>Questa voce  sull'argomento geometria è solo un <a href="/wiki/Aiuto:Abbozzo" title="Aiuto:Abbozzo">abbozzo</a></b>.<br /> <div style="font-size:90%;"><a class="external text" href="https://it.wikipedia.org/w/index.php?title=Geometria_riemanniana&action=edit">Contribuisci</a> a migliorarla secondo le <a href="/wiki/Aiuto:Manuale_di_stile" title="Aiuto:Manuale di stile">convenzioni di Wikipedia</a>. Segui i suggerimenti del <a href="/wiki/Progetto:Geometria" class="mw-redirect" title="Progetto:Geometria">progetto di riferimento</a>.</div> <div class="hide-when-compact"> </div> </div> </div> </div> <p>La <b>geometria riemanniana</b> è una branca della <a href="/wiki/Geometria_differenziale" title="Geometria differenziale">geometria differenziale</a> che studia le <a href="/wiki/Variet%C3%A0_riemanniana" title="Varietà riemanniana">varietà riemanniane</a>. </p><p>Una varietà riemanniana è un oggetto matematico che modellizza la nozione di "spazio curvo" di dimensione arbitraria. Su di esso sono definite molte delle usuali nozioni geometriche, quali angoli, distanze, volumi, linee rette (dette <a href="/wiki/Geodetica" title="Geodetica">geodetiche</a>). Sono inoltre presenti nozioni proprie agli spazi curvi, quali quella di <a href="/wiki/Curvatura" title="Curvatura">curvatura</a> e di <a href="/wiki/Tensore_metrico" title="Tensore metrico">tensore metrico</a>. </p><p>La teoria nasce con un articolo in cui il matematico tedesco <a href="/wiki/Bernhard_Riemann" title="Bernhard Riemann">Bernhard Riemann</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> generalizza la geometria differenziale delle superfici nello spazio. </p> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geometria_riemanniana&veaction=edit&section=1" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Geometria_riemanniana&action=edit&section=1" title="Edit section's source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1"><b>^</b></a> <span class="reference-text">(<span style="font-weight:bolder; font-size:80%"><abbr title="tedesco">DE</abbr></span>) <i><a rel="nofollow" class="external text" href="http://www.emis.de/classics/Riemann/Geom.pdf">Ueber die Hypothesen, welche der Geometrie zu Grunde liegen</a></i> (Sulle ipotesi su cui si basa la geometria)</span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geometria_riemanniana&veaction=edit&section=2" title="Modifica la sezione Altri progetti" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Geometria_riemanniana&action=edit&section=2" title="Edit section's source code: Altri progetti"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div id="interProject" class="toccolours" style="display: none; clear: both; margin-top: 2em"><p id="sisterProjects" style="background-color: #efefef; 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font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="https://www.britannica.com/science/Riemannian-geometry"><span style="font-style:italic;">Riemannian geometry</span></a>, su <span style="font-style:italic;"><a href="/wiki/Enciclopedia_Britannica" title="Enciclopedia Britannica">Enciclopedia Britannica</a></span>, Encyclopædia Britannica, Inc.</cite> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q761383#P1417" title="Modifica su Wikidata"><img alt="Modifica su Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/10px-Blue_pencil.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/15px-Blue_pencil.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/20px-Blue_pencil.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></li> <li><cite id="CITEREFMathWorld" class="citation web" style="font-style:normal">(<span style="font-weight:bolder; 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