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--- seminars:colloquium [2025/11/03 19:38] – qiao
+++ seminars:colloquium [2026/05/04 13:09] (current) – qiao
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+==== Spring 2026 ====
+**March 13th** \\ **[[hiltonmemorial:lecture2026|PETER HILTON MEMORIAL LECTURE]]** \\    **SPECIAL TIME AND LOCATION: March 13, 3:30pm, Alumni Lounge at Old O'Connor Hall** \\ Speaker: **Martin Bridson** (University of Oxford) \\ Title: **//Chasing finite shadows of infinite groups through geometry//** <WRAP box>// Abstract: // There are many situations in geometry or elsewhere in mathematics where it is natural or convenient to explore infinite groups of symmetries via their actions on finite objects. But how hard is it find these finite manifestations and  to what extent does the collection of all such actions determine the infinite group?
+In this colloquium, I will sketch some of the rich history of  such problems and then describe some of the great advances in recent years. I'll describe pairs of distinct groups that have the same finite images and I'll sketch the proof of some "profinite rigidity results", i.e. theorems showing that in certain circumstances one can identify an infinite group if one knows its set of finite images. \\
+ </WRAP>
+**Thursday May 7, 2026 2:45-3:45pm, WH-100E**\\  //Speaker//: ** [[ https://sites.math.washington.edu/~novik/ | Isabella Novik]] ** (University of Washington) \\ //Topic//: **//Lower bounds on face numbers//** \\
+<WRAP box 90%>
+**//Abstract//**:
+In this talk, I will discuss several approaches to studying the face numbers of simplicial complexes, with a particular focus on obtaining lower bounds. These approaches include classical rigidity theory, Stanley-Reisner rings, and higher‑dimensional stress spaces. I will also describe a number of both classical and recent results on face numbers that have been obtained using these tools.
+</WRAP>
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