<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>
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