Department of

# Mathematics

Seminar Calendar
for events the day of Monday, September 20, 2021.

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events for the
events containing

Questions regarding events or the calendar should be directed to Tori Corkery.
     August 2021           September 2021          October 2021
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5  6  7             1  2  3  4                   1  2
8  9 10 11 12 13 14    5  6  7  8  9 10 11    3  4  5  6  7  8  9
15 16 17 18 19 20 21   12 13 14 15 16 17 18   10 11 12 13 14 15 16
22 23 24 25 26 27 28   19 20 21 22 23 24 25   17 18 19 20 21 22 23
29 30 31               26 27 28 29 30         24 25 26 27 28 29 30
31


Monday, September 20, 2021

3:00 pm in 347 Altgeld Hall,Monday, September 20, 2021

#### Differential Geometry over C-infinity rings (part 1)

###### Eugene Lerman (UIUC)

Abstract: (joint work with Yael Karshon) We develop some basic tools of differential geometry for singular spaces. There is a variety of approaches to geometry on singular spaces going back to 1960's. The spaces we work with lie in the intersection of differential spaces of Sikorski and C-infinity schemes of Dubuc. We integrate vector fields to flows and we construct a C-infinity ring analogue of Grothendieck's algebraic de Rham complex. (part 1 of a two part talk, part 2 will be next week)

5:00 pm in 343 Altgeld Hall,Monday, September 20, 2021

#### Random Circuits and SDE's

###### Piexue Wu

Abstract: We continue with approximation of semigroups using Poisson process.