[Settfa] Tuesday 03/03, Tristan Bice 

kubis at math.cas.cz kubis at math.cas.cz
Fri Feb 28 12:00:01 CET 2020


 Tuesday 3rd March, 10:00am 

 Speaker:Tristan Bice , IM CAS
 Title: Reconstructing Étale Groupoids from Semigroups


 We show how to reconstruct etale groupoids from general semigroups of "bump" functions defined upon them. The essential idea is to extend Milgram's classic work from spaces to groupoids, using ultrafilters of such functions to recover the points. This allows us to unify a number of reconstruction theorems in the literature for C*-algebras, L^p-algebras, Steinberg algebras and inverse semigroups.
(joint work with Lisa Orloff Clark and Astrid an Huef)

 For more information see the seminar web page at 
 https://calendar.math.cas.cz/set-theory-and-analysis-actual .

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