<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">The following Distinguished Lecture tomorrow can be of interest to many on this list.<div dir="ltr"></div><div><br></div><div><div class="gmail_default" style="-webkit-text-size-adjust: auto; font-family: georgia, serif;"><font face="georgia, serif" color="#000000"><b><font style="vertical-align: inherit;"><font style="vertical-align: inherit;">When: </font></font></b><font style="vertical-align: inherit;"><font style="vertical-align: inherit;"> <span dir="ltr">Friday, March 28th at </span><b><font style="background-color: rgb(255, 255, 0);"><span dir="ltr">10:30AM CT</span></font></b></font></font></font></div><div style="-webkit-text-size-adjust: auto; font-family: georgia, serif;"><p class="MsoNormal" style="margin: 0in 0in 0.0001pt; line-height: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-origin: initial; background-clip: initial;"><font face="georgia, serif" color="#000000"> </font></p><p class="MsoNormal" style="margin: 0in 0in 0.0001pt; line-height: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-origin: initial; background-clip: initial;"><font face="georgia, serif" color="#000000"><font style="vertical-align: inherit;"><font style="vertical-align: inherit;"><b>Where: </b><span class="gmail_default"><b></b></span><span class="gmail_default">T</span></font></font>alk will be given <font style="font-weight: bold;"><u style="background-color: rgb(255, 255, 0);">live, in-person</u></font><font style="font-weight: bold;"> </font>at</font></p><p class="MsoNormal" style="margin: 0in; line-height: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-origin: initial; background-clip: initial;"><font color="#000000" face="georgia, serif"> TTIC, <span dir="ltr">6045 S. Kenwood Avenue</span></font></p><p class="MsoNormal" style="margin: 0in; line-height: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-origin: initial; background-clip: initial;"><font color="#000000" face="georgia, serif"><span dir="ltr"> 5th Floor, Room 530</span><b> </b></font></p><p class="MsoNormal" style="margin: 0in; line-height: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-origin: initial; background-clip: initial;"><font color="#000000" face="georgia, serif"><b><br></b></font></p><p class="MsoNormal" style="margin: 0in; line-height: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-origin: initial; background-clip: initial;"><font face="georgia, serif" color="#000000"><span class="gmail_default"><b>Virtually: </b>via Panopto<b> </b>(<a href="https://uchicago.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=256a48f8-b19e-47a2-b69e-b28e0117ffaa" target="_blank">Livestream</a>) </span><b><br></b></font></p><p class="MsoNormal" style="margin: 0in 0in 0.0001pt; line-height: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-origin: initial; background-clip: initial;"><font face="georgia, serif" color="#000000"> </font></p><p class="MsoNormal" style="margin: 0in 0in 0.0001pt; line-height: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-origin: initial; background-clip: initial;"><font face="georgia, serif" color="#000000"><b><font style="vertical-align: inherit;"><font style="vertical-align: inherit;">Who: <span class="gmail_default"></span> </font></font></b><span class="gmail_default"></span><span class="gmail_default"></span>Irit Dinur, Weizmann Institution of Science</font></p></div><div style="-webkit-text-size-adjust: auto; font-family: georgia, serif;"><b><font face="georgia, serif" color="#000000"><br></font></b></div><div style="-webkit-text-size-adjust: auto; font-family: georgia, serif;"><font face="georgia, serif" color="#000000"><b>Title: </b>Local-to-global" Theorems On High Dimensional Expanders</font></div><div style="-webkit-text-size-adjust: auto; font-family: georgia, serif;"><p></p><div><font face="georgia, serif" color="#000000"><b>Abstract: </b>Expansion in graphs is a well studied topic, with a wealth of applications in many areas of mathematics and the theory of computation.<span class="gmail_default"> </span>High dimensional expansion is a generalization of expansion from graphs to higher dimensional objects, such as simplicial complexes or partially ordered sets.</font></div><font face="georgia, serif" color="#000000">High dimensional expanders are still far from understood, but one fascinating new aspect is how global properties emerge from local ones. This phenomenon has already led to progress on longstanding questions in the areas of error-correcting codes, and Probabilistically Checkable Proofs (PCPs).<span class="gmail_default"> </span>I will describe the two key definitions: cosystolic expansion and link expansion. I will then describe how these relate to some of the exciting new applications.</font></div><br class="Apple-interchange-newline" style="-webkit-text-size-adjust: auto;"></div></body></html>