<div dir="ltr">Merhabalar,<div><br></div><div>02.03.2022 tarihinde  saat 14.00 te Boğaziçi Üniversitesinden  Araş. Gör. Oğuz Şavk başlık ve özeti aşağıda verilen bir konuşma yapacaktır.  Seminer Zoom programı üzerinden online yapılacaktır. Katılmak isteyenlerin katılım bilgilerini alabilmeleri için "<a href="mailto:huseyinuysal@istanbul.edu.tr" target="_blank">huseyinuysal@istanbul.edu.tr</a> " adresine mail atmaları gerekmektedir.<span style="font-family:tahoma,sans-serif"> </span></div><div><span style="font-family:tahoma,sans-serif"><br></span></div><div><span style="font-family:tahoma,sans-serif"><br></span></div><div><div class="gmail-adn gmail-ads" style="border-left:none;padding:0px;display:flex;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:medium"><div class="gmail-gs" style="margin:0px;padding:0px 0px 20px;width:1290.67px"><div class="gmail-"><div id="gmail-:1ce" class="gmail-ii gmail-gt" style="direction:ltr;margin:8px 0px 0px;padding:0px;font-size:0.875rem"><div id="gmail-:1c3" class="gmail-a3s gmail-aiL" style="font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:small;line-height:1.5;font-family:Arial,Helvetica,sans-serif;overflow:hidden"><div dir="ltr"><div><div>-----------------------------------------------------------------------------------<br><div><b>Başlık: </b>Three classical problems in low-dimensional topology</div><div><br></div><div><b>Özet: </b>In this talk, we present the following three classical and</div>unresolved problems of low-dimensional topology. They are about objects<br>called homology 3-spheres first introduced by Henri Poincaré at the<br>beginning of the twentieth century.<br><br>1. Which homology 3-spheres bound contractible 4-manifolds or homology<br>4-balls? (main problem)<br>2. Which homology 3-spheres are homology cobordant to S^3?<br>3. Which homology 3-spheres embed in S^4?<br><br>We discuss interactions amongst these three problems from a historical<br>perspective and state several open problems. Addressing the plumbing<br>construction of manifolds, we introduce natural sources of homology<br>3-spheres including Brieskorn spheres and Seifert fibered homology<br>spheres. In the end, we list all currently known results for plumbed<br>homology 3-spheres.</div><div>----------------------------------------------------------------------------------------</div></div><div><br></div><div><br></div><div>İyi Günler dilerim.</div><font color="#888888"><font color="#888888"><font color="#888888"><font color="#888888"><div>Temha</div></font></font></font></font></div><div class="gmail-yj6qo"></div><div class="gmail-adL"></div></div></div><div class="gmail-hi" style="border-bottom-left-radius:1px;border-bottom-right-radius:1px;padding:0px;width:auto;background:rgb(242,242,242);margin:0px"></div></div></div><div class="gmail-ajx" style="clear:both"></div></div><div class="gmail-gA gmail-gt gmail-acV" style="font-size:0.875rem;padding:0px;width:auto;border-bottom-left-radius:0px;border-bottom-right-radius:0px;border-top:none;margin:0px;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif"><div class="gmail-gB gmail-xu" style="border-top:0px;padding:0px"><div class="gmail-ip gmail-iq" style="clear:both;margin:0px;padding:16px 0px;border-top:none"><br class="gmail-Apple-interchange-newline"></div></div></div></div><br class="gmail-Apple-interchange-newline"></div>

<br>
<div><hr></div><div><font size="1"><font face="Arial" color="#808080"><em><b>Yasal Uyarı:</b> Bu elektronik posta, </em><b><a href="https://bilgiislem.istanbul.edu.tr/tr/duyuru/e-posta-yasal-uyari-e-mail-disclaimer-6400760071002D0059004B0075004A0039007400480039007900700046006200610041004F003200370077003200" target="_blank">buradan </a> </b><em>ulaşabileceğin<wbr>iz Koşul ve Şartlara tabidir.<br></em></font><em style="color:rgb(128,128,128);font-family:Arial"><b>Disclaimer: </b>This email is subject to the Terms and Conditions available <a href="https://bilgiislem.istanbul.edu.tr/tr/duyuru/e-posta-yasal-uyari-e-mail-disclaimer-6400760071002D0059004B0075004A0039007400480039007900700046006200610041004F003200370077003200" target="_blank"><u><b>here.</b></u></a></em></font></div><div><span style="background-color:white"><font color="#808080" size="2" face="Arial">----------------------</font></span><span style="background-color:rgb(255,255,255);color:rgb(128,128,128);font-family:Arial;font-size:small">--------<wbr>--------------</span><span style="background-color:rgb(255,255,255);color:rgb(128,128,128);font-family:Arial;font-size:small">----------------<wbr>------</span></div><div><span style="background-color:white"><font color="#808080" size="2" face="Arial">Lütfen bu e-postayı yazdırmadan önce çevreye olan etkisini dikkate alınız. Unutmayınız ki; dünyadaki kağıt tüketiminin yarısı kazanılırsa, her yıl 8 milyon hektar orman alanı (Ege Bölgesi büyüklüğünde) yok olmaktan kurtulacaktır.</font></span></div><div><span style="background-color:white"><font color="#808080" size="2" face="Arial">----------------------</font></span><span style="background-color:rgb(255,255,255);color:rgb(128,128,128);font-family:Arial;font-size:small">--------<wbr>--------------</span><span style="background-color:rgb(255,255,255);color:rgb(128,128,128);font-family:Arial;font-size:small">----------------<wbr>------</span></div><div><div><span style="background-color:white"><font color="#808080" size="2" face="Arial">Please take into account the impact on the environment before printing this e-mail. Do not forget that if we reduce our paper consumption by half, every year 8 million hectares of forest (an area </font></span><span style="color:rgb(128,128,128);font-family:Arial;font-size:small;background-color:white">the size of Aegean Region in Turkey) will be saved from vanishing.</span></div></div><div><span style="background-color:white"><font color="#808080" size="2" face="Arial">----------------------</font></span><span style="background-color:rgb(255,255,255);color:rgb(128,128,128);font-family:Arial;font-size:small">--------<wbr>--------------</span><span style="background-color:rgb(255,255,255);color:rgb(128,128,128);font-family:Arial;font-size:small">----------------<wbr>------</span></div>