Seminar tomorrow (Tuesday): James Rickards

[Bianca Viray]

Hi everyone,

Our speaker tomorrow is James Rickards from CU Boulder.  The seminar starts at 11am in PDL C-401, and we'll go to lunch with the speaker after the talk.

I look forward to seeing you there!

Title: The not-so-local-global conjecture 

Abstract: I will describe new obstructions found for Apollonian circle packings, which contradicts the local-global conjecture for many configurations. These obstructions come from quadratic and quartic reciprocity, and we expect similar obstructions to exist in other thin group orbits. Based on computational evidence, a new conjecture is formulated. This is joint work with Summer Haag, Clyde Kertzer, and Katherine E. Stange.

--

Bianca Viray (she/her)

Craig McKibben and Sarah Merner Professor of Mathematics

University of Washington

Seattle, WA 98195

https://sites.math.washington.edu/~bviray/