Department of

# Mathematics

Seminar Calendar
for events the day of Monday, April 24, 2017.

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events for the
events containing

Questions regarding events or the calendar should be directed to Tori Corkery.
      March 2017             April 2017              May 2017
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                      1       1  2  3  4  5  6
5  6  7  8  9 10 11    2  3  4  5  6  7  8    7  8  9 10 11 12 13
12 13 14 15 16 17 18    9 10 11 12 13 14 15   14 15 16 17 18 19 20
19 20 21 22 23 24 25   16 17 18 19 20 21 22   21 22 23 24 25 26 27
26 27 28 29 30 31      23 24 25 26 27 28 29   28 29 30 31
30


Monday, April 24, 2017

3:00 pm in 243 Altgeld Hall,Monday, April 24, 2017

#### The Relative Compactification of the Universal Centralizer(CANCELED)

###### Ana Balibanu (U Chicago)

Abstract: Let $G$ be a semisimple algebraic group of adjoint type. The universal centralizer $\mathcal X$ is the family of centralizers in $G$ of regular elements in Lie($G$). This algebraic variety has a natural symplectic structure, obtained by Hamiltonian reduction from the cotangent bundle $T^ ∗G$. We introduce a relative compactification of $\mathcal X$ , in which every centralizer fiber is replaced by its closure in the wonderful compactification of $G$. We show that the symplectic structure extends to a log-symplectic structure on the boundary, using the logarithmic cotangent bundle of the wonderful compactification.

4:00 pm in 239 Altgeld Hall,Monday, April 24, 2017

#### Retirement Reception

Abstract: A farewell open house for Chimesmaster Sue Woods will be held from 4-5 pm in 239 Altgeld Hall to recognize her many contributions to campus. Program at 4:30 pm.

4:00 pm in 245 Altgeld Hall,Monday, April 24, 2017

#### Some algorithmic problems for presentations of groups

###### Sergei Ivanov (Department of Mathematics, University of Illinois)

5:00 pm in 241Altgeld Hall,Monday, April 24, 2017

#### Locally Compact Groups and Duality

###### Terence Harris (UIUC&NSW)

Abstract: I will talk about locally compact groups and duality, both in the commutative and then the noncommutative case.