<div dir="ltr"><div dir="auto" style="font-size:12.8px;font-family:verdana,geneva,sans-serif">Dear colleagues,<br></div><div dir="auto" style="font-family:sans-serif;font-size:12.8px"><p style="font-family:verdana,geneva,sans-serif">You are cordially invited to the general seminar organized by the Department of Mathematics, Atılım University.</p><p><font face="Verdana, Geneva, sans-serif">Our speaker is <b> Ergün Yalçın </b>(Bilkent University)</font><font face="Verdana, Geneva, sans-serif">.</font></p><p style="font-family:verdana,geneva,sans-serif">Date: March<b> 11,</b> <b>2020</b></p><p style="font-family:verdana,geneva,sans-serif">Time: <b>15:40</b></p><p style="font-family:verdana,geneva,sans-serif">Place: <b>FEF 406</b></p><p style="font-family:verdana,geneva,sans-serif">Please find the abstract of the talk below.</p><p style="font-family:verdana,geneva,sans-serif">With my best regards,<br></p><div><p style="font-family:verdana,geneva,sans-serif">On behalf of Seminar Committee,</p></div></div><div dir="auto" style="font-family:sans-serif;font-size:12.8px;margin:0px;font-stretch:normal;line-height:normal"><span style="font-family:verdana,geneva,sans-serif">Burcu Gülmez Temür</span></div><div dir="auto" style="font-family:sans-serif;font-size:12.8px;margin:0px;font-stretch:normal;line-height:normal"><span style="font-family:verdana,geneva,sans-serif"><br></span></div><div dir="auto" style="font-family:sans-serif;font-size:12.8px;margin:0px;font-stretch:normal;line-height:normal"><span style="font-family:verdana,geneva,sans-serif"><br></span></div><div dir="auto" style="font-family:sans-serif;font-size:12.8px;margin:0px;font-stretch:normal;line-height:normal"><span style="font-family:Arial,Helvetica,sans-serif;font-size:small">Title: Cohomology groups of small categories</span><br style="font-family:Arial,Helvetica,sans-serif;font-size:small"><br style="font-family:Arial,Helvetica,sans-serif;font-size:small"><span style="font-family:Arial,Helvetica,sans-serif;font-size:small">Abstract: Given a discrete group G, there is a classifying space BG whose homotopy type </span><span style="font-family:Arial,Helvetica,sans-serif;font-size:small">is uniquely determined by the group G. The cohomology of the group G is defined to be the </span><span style="font-family:Arial,Helvetica,sans-serif;font-size:small">cohomology of the space BG. As a generalization of this, the classifying space BC is defined </span><span style="font-family:Arial,Helvetica,sans-serif;font-size:small">for a small category C as a simplicial set, and the cohomology of the category C is defined </span><span style="font-family:Arial,Helvetica,sans-serif;font-size:small">to be the cohomology of BC. I will talk about some open problems related to the cohomology </span><span style="font-family:Arial,Helvetica,sans-serif;font-size:small">of small categories coming from the representation theory of finite groups.</span>  <span style="font-family:verdana,geneva,sans-serif"><br></span></div></div>