Department of

# Mathematics

Seminar Calendar
for events the day of Monday, March 15, 2021.

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events for the
events containing

Questions regarding events or the calendar should be directed to Tori Corkery.
    February 2021            March 2021             April 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       1  2  3  4  5  6                1  2  3
7  8  9 10 11 12 13    7  8  9 10 11 12 13    4  5  6  7  8  9 10
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21 22 23 24 25 26 27   21 22 23 24 25 26 27   18 19 20 21 22 23 24
28                     28 29 30 31            25 26 27 28 29 30



Monday, March 15, 2021

12:00 pm in Zoom (http://bit.ly/AH-IH0315),Monday, March 15, 2021

#### Altgeld & Illini Halls building project update

###### Department of Mathematics (Illinois Math)

Abstract: Department chair Jeremy Tyson will provide a building project update, including a tour through the building plans for both Altgeld and Illini Halls. This same content will be shared at the department's town hall meeting on March 12 at 4 p.m. Please note: You will need to authenticate with Zoom (either through Zoom Illinois or Zoom.us) to enter the meeting.

3:00 pm in Zoom,Monday, March 15, 2021

#### Equivariant motivic orientations

###### Tsutomu Okano (UIUC)

Abstract: For a finite abelian group A, I will introduce the notion of oriented spectra in A-equivariant motivic homotopy theory. Orientation yields a theory of Chern classes which can be used to compute the cohomology of Grassmannians. As an application, we obtain the equivariant motivic analogue of the Snaith theorem. Please email vb8 at illinois dot edu for the zoom details.

3:00 pm in zoom,Monday, March 15, 2021

#### Stacky Hamiltonian actions and symplectic reduction

###### Reyer Sjamaar (Cornell)

Abstract: Extending work of Lerman and Malkin, we introduce the notion of a Hamiltonian action of an étale Lie group stack on an étale symplectic stack and establish versions of some basic theorems of symplectic geometry in this context, such as the Kirwan convexity theorem and the Mayer-Marsden-Weinstein symplectic reduction theorem. This is joint work with Benjamin Hoffman.

5:00 pm in Altgeld Hall,Monday, March 15, 2021

#### Seemingly injective von Neumann algebras

###### Timur Oikhberg

Abstract: We study Pisier's paper on a property which looks like injectivity, but holds for free group factors. https://illinois.zoom.us/j/87333719853?pwd=bFdWSkdqeEt1M3djNmVEU2Jvb3JzUT09