Department of

# Mathematics

Seminar Calendar
for events the day of Friday, February 17, 2017.

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events for the
events containing

Questions regarding events or the calendar should be directed to Tori Corkery.
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1  2  3  4  5  6  7             1  2  3  4             1  2  3  4
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Friday, February 17, 2017

3:00 pm in 243 Altgeld Hall,Friday, February 17, 2017

#### What is a Topological Quantum Field Theory?

###### Lutian Zhao (UIUC Math)

Abstract: In this talk we will introduce the physicists' definition of topological quantum field theory, mainly focusing on cohomological quantum field theory introduced by Witten. We will discuss topological twisting and see what topological invariant is actually computed. If time permits, we will see how Gromov-Witten invariants are constructed by physics.

4:00 pm in 241 Altgeld Hall,Friday, February 17, 2017

#### Hyperbolic taxi cabs and conic kitty cats: a mathematical activity and coloring book

###### Melinda Lanius (UIUC Math)

Abstract: In this extremely interactive talk, we will develop intuition for various metrics that I have encountered in my own research. We’ll work our way through understanding more familiar spaces such as the real plane as well as hyperbolic plane and disk, to less familiar objects: such as a surface with a Euclidean, cylindrical, or hyperbolic-funnel end. Some markers and colored pencils will be provided, but please feel free to bring your own fun office supplies.

4:00 pm in 345 Altgeld Hall,Friday, February 17, 2017