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alt="Vísindavefurinn"><span>Vísindavefurinn</span></a></div> <div class="header-mobile"> <nav class="mobile-nav" role="navigation"> <ul> <li class="categories"><a href="/vegna_thess.php?id="><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-list"><line x1="8" y1="6" x2="21" y2="6"></line><line x1="8" y1="12" x2="21" y2="12"></line><line x1="8" y1="18" x2="21" y2="18"></line><line x1="3" y1="6" x2="3.01" y2="6"></line><line x1="3" y1="12" x2="3.01" y2="12"></line><line x1="3" y1="18" x2="3.01" y2="18"></line></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-x"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></svg> 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src="/design/i_vv/icon-category.svg" alt=""> <span>Allir flokkar</span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=3"> <img src="/design/i_vv/icon-diversity.svg" alt=""> <span style="color:#719500"> Félagsvísindi </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=11"> <img src="/design/i_vv/icon-spa.svg" alt=""> <span style="color:#0098AA"> Heilbrigðisvísindi </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=2"> <img src="/design/i_vv/icon-neurology.svg" alt=""> <span style="color:#c0a14b"> Hugvísindi </span> <img class="arrow-icon" src="/design/i_vv/arrow_right.svg"> </a> </li> <li class="cat-teal"> <a href="/vegna_thess.php?id=152"> <img src="/design/i_vv/icon-school.svg" alt=""> <span style="color:#AC1A2F"> Menntavísindi </span> <img 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href="/svar.php?id=70790">Þjónusta</a></li> <li class="search"> <form class="searchbar" action="/search/" method="GET"> <input type="search" name="q" class="d-search" placeholder="Sláðu inn leitarorð og ýttu á „enter“" /> <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none"> <mask id="mask0_853_7542" style="mask-type:alpha" maskUnits="userSpaceOnUse" x="0" y="0" width="24" height="24"> <rect width="24" height="24" fill="#D9D9D9"/> </mask> <g mask="url(#mask0_853_7542)"> <path d="M19.6 21L13.3 14.7C12.8 15.1 12.225 15.4167 11.575 15.65C10.925 15.8833 10.2333 16 9.5 16C7.68333 16 6.146 15.371 4.888 14.113C3.62933 12.8543 3 11.3167 3 9.5C3 7.68333 3.62933 6.14567 4.888 4.887C6.146 3.629 7.68333 3 9.5 3C11.3167 3 12.8543 3.629 14.113 4.887C15.371 6.14567 16 7.68333 16 9.5C16 10.2333 15.8833 10.925 15.65 11.575C15.4167 12.225 15.1 12.8 14.7 13.3L21 19.6L19.6 21ZM9.5 14C10.75 14 11.8127 13.5627 12.688 12.688C13.5627 11.8127 14 10.75 14 9.5C14 8.25 13.5627 7.18733 12.688 6.312C11.8127 5.43733 10.75 5 9.5 5C8.25 5 7.18733 5.43733 6.312 6.312C5.43733 7.18733 5 8.25 5 9.5C5 10.75 5.43733 11.8127 6.312 12.688C7.18733 13.5627 8.25 14 9.5 14Z" fill="#4E4E4E"/> </g> </svg> </form> </li> <li class="lang"><img src="/design/i_vv/lang.svg?2024" alt="English"><a href="http://www.why.is/">EN</a></li> </ul> <a href="/search/" class="search-button btn btn-light"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-search"><circle cx="11" cy="11" r="8"></circle><line x1="21" y1="21" x2="16.65" y2="16.65"></line></svg></a> <div class="header-question"> <a href="/hvers_vegna.php?id=" onclick="javascript:$('a.send-question').click(); return false;" class="btn send">Senda inn spurningu <img src="/design/i_vv/message.svg" alt="message icon"></a> </div> </nav> <div class="header-data"> <div class="data-item"> <img src="/design/i_vv/icon-sun.svg" alt="Sólin"> Sólin <strong>Rís 06:34 • sest 20:29</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-moon.svg" alt="Tunglið"> Tunglið <strong>Rís 00:00 • Sest 00:00</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-flood.svg" alt="Flóð"> Flóð <strong>Árdegis: 10:54 • Síðdegis: 23:25</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-tide.svg" alt="Fjaran"> Fjara <strong>Árdegis: 04:40 • Síðdegis: 16:54</strong> <span>í Reykjavík</span> </div> </div> </div> </div> <div class="header-data"> <div class="data-item"> <img src="/design/i_vv/icon-sun.svg" alt="Sólin"> Sólin <strong>Rís 06:34 • sest 20:29</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-moon.svg" alt="Tunglið"> Tunglið <strong>Rís 00:00 • Sest 00:00</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-flood.svg" alt="Flóð"> Flóð <strong>Árdegis: 10:54 • Síðdegis: 23:25</strong> <span>í Reykjavík</span> </div> <div class="data-item"> <img src="/design/i_vv/icon-tide.svg" alt="Fjaran"> Fjara <strong>Árdegis: 04:40 • Síðdegis: 16:54</strong> <span>í Reykjavík</span> </div> </div> </header> <div class="poppin md-send"> <a class="instructions" href="#">Leiðbeiningar<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-help-circle"><circle cx="12" cy="12" r="10"></circle><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"></path><line x1="12" y1="17" x2="12.01" y2="17"></line></svg></a><a class="instructions-close" href="#">Til baka <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-arrow-left"><line x1="19" y1="12" x2="5" y2="12"></line><polyline points="12 19 5 12 12 5"></polyline></svg></a> <h2>Sendu inn spurningu </h2> <div class="instructions-more"> <p class="first">Hér getur þú sent okkur nýjar spurningar um vísindaleg efni.</p> <p>Hafðu spurninguna stutta og hnitmiðaða og sendu aðeins eina í einu. Einlægar og vandaðar spurningar um mikilvæg efni eru líklegastar til að kalla fram vönduð og greið svör. Ekki er víst að tími vinnist til að svara öllum spurningum.</p> <p>Persónulegar upplýsingar um spyrjendur eru eingöngu notaðar í starfsemi vefsins, til dæmis til að svör verði við hæfi spyrjenda. Spurningum er ekki sinnt ef spyrjandi villir á sér heimildir eða segir ekki nægileg deili á sér.</p> <p>Spurningum sem eru ekki á verksviði vefsins er eytt.</p> <p>Að öðru leyti er hægt að spyrja Vísindavefinn um allt milli himins og jarðar!</p> <div class="content-left-sep"></div> </div> <form action="/hvers_vegna.php?id=" method="POST" name="question_send"> <div class="md-fields"> <input type="hidden" name="step" value="4"> <div class="md-input"> <label for="s-fname">Nafn</label> <input type="text" name="f_name" class="send-input" id="s-fname" required="required" value=""> <input type="hidden" name="l_name" class="send-input" id="s-sname" value=""> </div> <div class="md-input"> <label for="s-email">Netfang</label> <input type="email" name="email" class="send-input" id="s-email" required="required" value=""> </div> <div class="md-input"> <label for="s-byear">Fæðingarár</label> <input type="number" name="birthyear" class="send-input" id="s-byear" maxlength="4" required="required" value=""> </div> <div class="md-input"> <label for="s-math">Ruslpóstvörn</label> <input type="hidden" name="vv_math_problem_hash_id" class="vv_math_problem_hash_id" id="vv_math_problem_hash_id" value=""> <input type="text" name="vv_math_problem_answer" id="vv_math_problem_answer" class="send-input" valuesize="2" maxlength="2" required="required" style="width: 30%;"> <span class="s-math-container"> = <span class="math_problem_num1_txt"></span> <img class="math_problem_math_icon" src="" /> <span class="math_problem_num2_txt"></span> </span> </div> <div class="md-input"> <label for="s-question">Spurning</label> <textarea type="text" name="question" class="send-input i-question" id="s-question" rows="6" required="required"></textarea> </div> </div> <div class="md-actions"> <button type="button" value="" class="btn btn-white"><i data-feather="x"></i> Hætta við</button> <button type="submit" value="Senda" class="btn send-button"><i data-feather="check"></i> Senda</button> </div> </form> </div> <section class="layout"> <div class="main-content"> <section class="layout-item"> <div class="article-wrapper"> <article class="default-article"> <div class="article-header"> <h1> <a href="/svar.php?id=87451" > Er ennþá verið að finna upp á nýjum formúlum og jöfnum í stærðfræði? </a> </h1> </div> <div class="article-meta"> <div class="publish-date" style="display: block;"> <h4>Útgáfudagur:</h4> <p>04.04.2025</p> </div> <div class="publisher" style="display: none;"> <h4>Spyrjandi:</h4> <p>Mikael Máni Ólafsson </p> </div> <div class="author"> <h4>Höfundur:</h4> <p>Sigurður Örn Stefánsson</p> </div> </div> <div class="article-text"> <p> Svarið við spurningunni er - já svo sannarlega. Hins vegar er það ekki endilega svo vel þekkt meðal þeirra sem ekki fást við stærðfræði dags daglega. Þessi nýja stærðfræði er þó oft mun nær okkur en mætti ætla og er samofin flestum tækninýjungum. Sem ... </p> <a href="/svar.php?id=87451" class="btn btn-brand">Sjá nánar <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"> <g id="Icon"> <path id="arrow_forward" d="M12 20L10.575 18.6L16.175 13H4V11H16.175L10.575 5.4L12 4L20 12L12 20Z" fill="#1C1C1C"/> </g> </svg> </a> </div> </article> <div class="article-hero"> <a href="/svar.php?id=87451"> <img src="/myndir/thumbs/smith_flis_einstein_310325_thumb_600w.png" alt="Er ennþá verið að finna upp á nýjum formúlum og jöfnum í stærðfræði?" /> </a> </div> </div> </section> <!-- ads begin --> <section class="layout-item"> <div class="sp-top-img" style="text-align: center;" > <a href="http://www.hhi.is" target="_blank"><img src="/auglysingar/hhi_visindavefur_2025.gif" alt="HHÍ - febrúar 2025 auglýsing" /></a> </div> </section> <!-- ads end --> <section class="backdrop-blue"> <div class="recent-answers layout-item"> <h2 class="section-title">Nýjustu svörin</h2> <a class="arrow-btn" href="/vegna_thess.php?id=138">Skoða öll nýjustu svörin <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-arrow-right"><line x1="5" y1="12" x2="19" y2="12"></line><polyline points="12 5 19 12 12 19"></polyline></svg></a></h2> <div class="recent-answers-wrapper"> <article class="recent-article"> <a href="/svar.php?id=87555" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Málvísindi: íslensk </div> <h4>Hversu gamalt er orðið gerpla í málinu og hvað þýðir það? </h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=87458" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #0098AA" > Læknisfræði </div> <h4>Er eitthvað vitað um langtímaafleiðingar rafrettureykinga?</h4> </a> </article> <article class="recent-article"> <a href="/svar.php?id=87281" class="recent-article-wrapper"> <div class="recent-category" style="border-color: #c0a14b" > Heimspeki </div> <h4>Er hægt að fara rangt með staðreyndir?</h4> </a> </article> </div> </div> </section> <section class="layout-item"> <div class="science-calendar"> <h2 class="section-title">Vísindadagatal 4. apríl</h2> <div class=""> <a href="/svar.php?id=59224" class="science-calendar-wrapper" id="science-calendar-story" > <div class="science-item-hero"> <img src="/myndir/sciday_poincare.jpg" alt="Henri Poincaré"> </div> <div class="science-item-content"> <p class="section-title">Vísindasagan</p> <h1>Henri Poincaré</h1> <h2>1854-1912</h2> <p>Franskur stærðfræðingur, eðlisfræðingur og vísindaheimspekingur, afar fjölhæfur. Lagði grunninn að ringl-hugtakinu (chaos) og setti fram atriði í afstæðiskenningunni.</p> <div class="btn">Nánar <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><g id="Icon"><path id="arrow_forward" d="M12 20L10.575 18.6L16.175 13H4V11H16.175L10.575 5.4L12 4L20 12L12 20Z" fill="#1C1C1C"></path></g></svg> </div> </div> </a> <a href="/svar.php?id=62865" class="science-calendar-wrapper" id="science-calendar-informed" > <div class="science-item-hero"> <img src="/myndir/sciday_2016_94.jpg" alt=" Farsími"> </div> <div class="science-item-content"> <p class="section-title">Dagatal hinna upplýstu</p> <h1> Farsími</h1> <h2></h2> <p>Farsímar eru í raun flókin útvarpstæki. Munurinn er helst sá að þeir taka ekki bara á móti rafsegulbylgjum eins og útvarpstækin, heldur geta þeir líka sent þær frá sér. Tíðni bylgnanna sem þeir nota er einnig allt önnur en í útvarpi. Í dag eru allir farsímar stafrænir. Fyrsta símtal með farsíma átti sér stað 1973. Tíu árum síðar fóru fyrstu farsímarnir á markað.</p> <div class="btn">Nánar <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><g id="Icon"><path id="arrow_forward" d="M12 20L10.575 18.6L16.175 13H4V11H16.175L10.575 5.4L12 4L20 12L12 20Z" fill="#1C1C1C"></path></g></svg> </div> </div> </a> <a href="/svar.php?id=75590" class="science-calendar-wrapper" id="science-calendar-icelandic" > <div class="science-item-hero"> <img src="/myndir/gudbjorg_andrea_jonsdottir_040418.png" alt="Guðbjörg Andrea Jónsdóttir"> </div> <div class="science-item-content"> <p class="section-title">Íslenskir vísindamenn</p> <h1>Guðbjörg Andrea Jónsdóttir</h1> <h2>1960</h2> <p>Guðbjörg Andrea Jónsdóttir er forstöðumaður Félagvísindastofnunar Háskóla Íslands. 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