Department of

Mathematics


Seminar Calendar
for events the day of Monday, December 2, 2013.

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Questions regarding events or the calendar should be directed to Tori Corkery.
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Monday, December 2, 2013

10:00 am in Altgeld Hall,Monday, December 2, 2013

Relative equilibria and vector fields on stacks

Eugene Lerman (UIUC Math)

Abstract: TBA

4:00 pm in 241 Altgeld Hall,Monday, December 2, 2013

Thin groups: arithmetic and beyond

Elena Fuchs (California-Berkeley)

Abstract: In 1643, Rene Descartes discovered a formula relating curvatures of circles in Apollonian circle packings, constructed by Apollonius of Perga in 200 BC. This formula has recently led to a connection between the construction of Apollonius and orbits of a certain so-called thin subgroup G of GL_4(Z). This connection is key in recent results on the arithmetic of Apollonian packings, which I will describe in this talk. A crucial ingredient in the proofs is the spectral gap coming from families of expander graphs associated to G -- this gap is far less understood in the case of thin groups than that of non-thin groups. Motivated by this problem, I will then discuss the ubiquity of thin groups and present results on thinness of monodromy groups of hypergeometric equations in the case where these groups act on hyperbolic space.

4:00 pm in 141 Altgeld Hall,Monday, December 2, 2013

Strategies for a Successful Job Search

Katherine Chun Eriksen (Graduate College Career Services)

Abstract: Presentation and discussion on how to identify and apply for nonacademic internships or full-time positions. All mathematics graduate students are welcome.

5:00 pm in 241 Altgeld,Monday, December 2, 2013

An introduction to coding theorems for quantum capacity, III

Gao Li (UIUC Math)