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Beschikbaar in 10 talen" > <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-10" 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">10 talen</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D9%87%D9%86%D8%AF%D8%B1%DB%8C%DA%A9_%DA%A9%D9%84%D9%88%D8%B3%D8%AA%D8%B1%D9%85%D8%A7%D9%86" title="هندریک کلوسترمان – South Azerbaijani" lang="azb" hreflang="azb" data-title="هندریک کلوسترمان" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Hendrik_Kloosterman" title="Hendrik Kloosterman – Catalaans" lang="ca" hreflang="ca" data-title="Hendrik Kloosterman" data-language-autonym="Català" data-language-local-name="Catalaans" 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/Hendrik_Kloosterman" title="Hendrik Kloosterman – Tsjechisch" lang="cs" hreflang="cs" data-title="Hendrik Kloosterman" data-language-autonym="Čeština" data-language-local-name="Tsjechisch" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Hendrik_Kloosterman" title="Hendrik Kloosterman – Duits" lang="de" hreflang="de" data-title="Hendrik Kloosterman" data-language-autonym="Deutsch" data-language-local-name="Duits" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Hendrik_Kloosterman" title="Hendrik Kloosterman – Engels" lang="en" hreflang="en" data-title="Hendrik Kloosterman" data-language-autonym="English" data-language-local-name="Engels" class="interlanguage-link-target"><span>English</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%B1%DB%8C%DA%A9_%DA%A9%D9%84%D9%88%D8%B3%D8%AA%D8%B1%D9%85%D8%A7%D9%86" title="هندریک کلوسترمان – Perzisch" lang="fa" hreflang="fa" data-title="هندریک کلوسترمان" data-language-autonym="فارسی" data-language-local-name="Perzisch" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Hendrik_Kloosterman" title="Hendrik Kloosterman – Frans" lang="fr" hreflang="fr" 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id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="nl" dir="ltr"><p><b>Hendrik Douwe Kloosterman</b> (<a href="/wiki/Rottevalle" title="Rottevalle">Rottevalle</a>, <a href="/wiki/9_april" title="9 april">9 april</a> <a href="/wiki/1900" title="1900">1900</a> – <a href="/wiki/Leiden" title="Leiden">Leiden</a>, <a href="/wiki/6_mei" title="6 mei">6 mei</a> <a href="/wiki/1968" title="1968">1968</a>) was een <a href="/wiki/Nederland" title="Nederland">Nederlands</a> <a href="/wiki/Wiskundige" title="Wiskundige">wiskundige</a>. Hij werd in 1926 bekend door publicatie van een artikel in <i><a href="/wiki/Acta_Mathematica" title="Acta Mathematica">Acta Mathematica</a></i> over exponentiële sommen, die thans bekendstaan als <a href="/w/index.php?title=Kloosterman-sommen&action=edit&redlink=1" class="new" title="Kloosterman-sommen (de pagina bestaat niet)">Kloosterman-sommen</a>. </p><p>Kloosterman volgde de middelbare school in <a href="/wiki/Den_Haag" title="Den Haag">Den Haag</a> en studeerde aan de <a href="/wiki/Universiteit_Leiden" title="Universiteit Leiden">Universiteit Leiden</a> waar hij in 1922 afstudeerde. Na bemiddeling door <a href="/wiki/Paul_Ehrenfest" title="Paul Ehrenfest">Paul Ehrenfest</a> studeerde Kloosterman aan de <a href="/wiki/Universiteit_van_Kopenhagen" title="Universiteit van Kopenhagen">Universiteit van Kopenhagen</a> bij <a href="/wiki/Harald_Bohr" title="Harald Bohr">Harald Bohr</a> en aan de <a href="/wiki/Universiteit_van_Oxford" title="Universiteit van Oxford">Universiteit van Oxford</a> bij <a href="/wiki/Godfrey_Harold_Hardy" title="Godfrey Harold Hardy">Godfrey Harold Hardy</a>. In 1924 <a href="/wiki/Wetenschappelijke_promotie" title="Wetenschappelijke promotie">promoveerde</a> hij bij <a href="/wiki/Jan_Cornelis_Kluyver" title="Jan Cornelis Kluyver">Jan Cornelis Kluyver</a> op zijn <a href="/wiki/Proefschrift" title="Proefschrift">proefschrift</a> "Over het splitsen van gehele positieve getallen in een som van kwadraten". In 1925 vervulde hij zijn <a href="/wiki/Militaire_dienstplicht" class="mw-redirect" title="Militaire dienstplicht">militaire dienstplicht</a>, en in het volgende jaar publiceerde Kloosterman in <i>Acta Mathematica</i> zijn artikel "On the representation of nummers in the form ax² + by² + cz² + dt²" waardoor hij beroemd zou worden. </p><p>Van 1926 tot 1928 studeerde hij met een <i><a href="/w/index.php?title=Rockefeller_Scholarship&action=edit&redlink=1" class="new" title="Rockefeller Scholarship (de pagina bestaat niet)">Rockefeller Scholarship</a></i> aan de <a href="/wiki/Universiteit_van_G%C3%B6ttingen" class="mw-redirect" title="Universiteit van Göttingen">Universiteit van Göttingen</a> bij <a href="/wiki/Edmund_Landau" title="Edmund Landau">Edmund Landau</a>, en aan de <a href="/wiki/Universiteit_Hamburg" title="Universiteit Hamburg">Universiteit Hamburg</a> bij <a href="/wiki/Erich_Hecke" title="Erich Hecke">Erich Hecke</a>. Van 1928 tot 1930 was hij assistent in <a href="/wiki/M%C3%BCnster_(stad)" title="Münster (stad)">Münster</a>. In 1930 werd hij aan de Universiteit Leiden tot <a href="/wiki/Lector" title="Lector">lector</a> benoemd, en in 1947 volgde zijn benoeming tot <a href="/wiki/Hoogleraar" title="Hoogleraar">hoogleraar</a> aldaar. Kloosterman werd in 1950 verkozen tot lid van de <a href="/wiki/Koninklijke_Nederlandse_Akademie_van_Wetenschappen" title="Koninklijke Nederlandse Akademie van Wetenschappen">Koninklijke Nederlandse Akademie van Wetenschappen</a> (KNAW). Hij overleed op 68-jarige leeftijd. </p><p>Kloosterman was voorzitter van het <a href="/wiki/Koninklijk_Wiskundig_Genootschap" title="Koninklijk Wiskundig Genootschap">Wiskundig Genootschap</a> (1948-1950) en redactielid en secretaris van het <i><a href="/wiki/Nieuw_Archief_voor_Wiskunde" title="Nieuw Archief voor Wiskunde">Nieuw Archief voor Wiskunde</a></i> (1937-1953). Hij was gehuwd met Margarete Träger, die hij in 1930 in Münster had leren kennen. </p> <div class="toccolours appendix" role="presentation" style="font-size:90%; margin:1em 0 -0.5em; clear:both;"> <div><span style="font-weight:bold">Bronnen, noten en/of referenties</span></div> <ul><li>Dit artikel of een eerdere versie ervan is een (gedeeltelijke) vertaling van het artikel <span class="plainlinks"><a class="external text" href="https://fy.wikipedia.org/wiki/Hindrik_Kloosterman?oldid=290643">Hindrik Kloosterman</a> op de Friestalige Wikipedia, dat onder de licentie <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/3.0/deed.nl">Creative Commons Naamsvermelding/Gelijk delen</a> valt. Zie de <a class="external text" href="https://fy.wikipedia.org/wiki/Hindrik_Kloosterman?offset=20100816235959&action=history">bewerkingsgeschiedenis</a></span> aldaar.<style data-mw-deduplicate="TemplateStyles:r66936091">.mw-parser-output .error-bronvermelding{color:#ff0000;font-weight:bold}.mw-parser-output .error-bronvermelding span{font-size:larger}</style></li> <li><a rel="nofollow" class="external text" href="http://alexandria.tue.nl/repository/freearticles/597541.pdf">in memoriam H. D. Kloosterman 1900 - 1968</a> (<a href="/wiki/Portable_Document_Format" class="mw-redirect" title="Portable Document Format">PDF</a>) door <a href="/wiki/Fred_van_der_Blij" class="mw-redirect" title="Fred van der Blij">F. van der Blij</a> en <a href="/wiki/Nicolaas_Govert_de_Bruijn" title="Nicolaas Govert de Bruijn">N.G. de Bruijn</a> in <i>Nieuw Archief voor Wiskunde</i> (1968) pagina 139-147</li> <li><style data-mw-deduplicate="TemplateStyles:r67679320">.mw-parser-output .taalaanduiding{font-family:sans-serif;font-size:85%;cursor:help;color:var(--color-subtle,#555)}.mw-parser-output .taalaanduiding span{border-bottom:1px dotted var(--color-subtle,#555)}</style><span class="taalaanduiding" title="Taal: Engels">(<span>en</span>) </span> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110709102212/http://www.math.leidenuniv.nl/nl/kloosterman/lifeandwork/">Kloosterman, leven en werk</a>, pagina bij Mathematisch Instituut Leiden</li></ul> <div class="reflist" 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