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<span style="margin:0px;font-size:12pt;background-color:rgb(255, 255, 255) !important"><span style="margin:0px;background-color:rgb(255, 255, 255) !important"><span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;">Merhabalar,</span></span></span><span style="margin:0px;background-color:rgb(255, 255, 255);display:inline !important"></span><span style="background-color:rgb(255, 255, 255);display:inline !important"></span></div>
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<span style="margin:0px;background-color:rgb(255, 255, 255) !important"><span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;">25 May</span><span style="margin:0px;font-size:9pt;font-family:Arial, Helvetica, sans-serif"><span style="margin: 0px; background-color: rgb(255, 255, 255); display: inline !important; font-size: 11pt;">ı</span></span><span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;">s
Çarşamba günü saat 15.00'de Koç Üniversitesi'nden Asgar Jamneshan</span></span><span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;"> Galatasaray Üniversitesi'nde bir konuşma verecektir. </span><span style="margin:0px;font-size:9pt;font-family:Arial, Helvetica, sans-serif"><span style="margin:0px;font-size:16px;font-family:Calibri, Helvetica, sans-serif;background-color:rgb(255, 255, 255) !important"><span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;">Konuşma
Microsoft Teams üzerinden online olarak yapılacaktır. İlgilenenler konu</span><span style="margin:0px;font-size:9pt;font-family:Arial, Helvetica, sans-serif"><span style="background-color: rgb(255, 255, 255); display: inline !important; font-size: 11pt;">ş</span></span><span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;">ma
linki i</span><span style="margin:0px;font-size:9pt;font-family:Arial, Helvetica, sans-serif"><span style="background-color: rgb(255, 255, 255); display: inline !important; font-size: 11pt;">çi</span></span><span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;">n
ozgeulkem@gmail.com adresine mail atabilirler. </span><span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;">Konuşmanın detaylarını aşağıda bulabilirsiniz.</span></span><br class="Apple-interchange-newline">
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<span style="font-family: Arial, Helvetica, sans-serif; font-size: 11pt;">Sevgiler,</span><br>
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<span style="margin: 0px; font-size: 11pt; font-family: Arial, Helvetica, sans-serif;">Özge Ülkem</span></div>
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<div style="font-size:12pt;background-color:rgb(255, 255, 255)"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); font-size: 11pt;"><b>Title: The structure of arbitrary Conze-Lesigne systems</b></span></div>
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<div style="font-size:12pt;background-color:rgb(255, 255, 255)"><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); font-size: 11pt;">Abstract: Conze-Lesigne systems are abelian measure-preserving dynamical systems which are isomorphic
to their second Host-Kra-Ziegler factors. These factors (and their versions of higher order) are relevant</span><span style="color:rgb(34, 34, 34);background-color:rgb(255, 255, 255)"><span style="font-size: 11pt;"> </span></span><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); font-size: 11pt;"></span><span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255); font-size: 11pt;">in
multiple recurrence and related topics in additive combinatorics (e.g. Szemeredi's theorem). In this talk, we present a structure theorem for Conze-Lesigne systems for actions of an arbitrary countable discrete abelian group, describing such systems as an
inverse limit of translational systems G/L, where G is a locally compact nilpotent group of nilpotency class 2 and L is a lattice in G. Such structure theorems were previously known in the important special cases of finitely generated abelian groups by work
of Conze and Lesigne and direct sums of finite fields by work of Bergelson, Tao, and Ziegler. We will review some of this literature by way of illustrating examples. If time permits, we present an application of our structure theorem to give a qualitative
proof of the inverse theorem for the Gowers U^3-uniformity norm of an arbitrary finite abelian group via a correspondence principle. This talk is based on work jointly with </span><span style="font-size: 11pt;">Shalom and Tao. I will introduce and motivate
the topic to a general mathematical audience in the first half of my talk. </span></div>
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