Seminar Calendar
for events the day of Thursday, October 25, 2012.

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Thursday, October 25, 2012

Department of Mathematics Retiree's Luncheon
11:30 am   in Urbana Country Club,  Thursday, October 25, 2012
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Submitted by seminar.

Math/Theoretical Physics Seminar
12:00 pm   in 464 Loomis Laboratory,  Thursday, October 25, 2012
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Submitted by katz.
Marius Junge (Illinois Math)
Non-locality from a math perspective
Abstract: We discuss several ways to measure how  a bipartite  state can be used to perform non-local experiments. Traditionally, the entropy of entanglement is considered as such a measure. A more recent approach consists on constructing Bell-type inequalities as a witness of non-locality. The mathematical results will show that certain states are non-local in a very robust sense. If time allows we will describe recent results of Palazuelos, formerly a postdoc at UIUC, on superactivation of non-locality.

Group Theory Seminar
1:00 pm   Thursday, October 25, 2012
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Submitted by kapovich.
No seminar today, because of the departmental retiree's luncheon

Analysis Seminar
2:00 pm   in 243 Altgeld Hall,  Thursday, October 25, 2012
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Submitted by aimo.
Valentino Magnani (University of Pisa, Italy)
On the sub-Riemannian measure of submanifolds
Abstract: We present an explicit formula for the sub-Riemannian measure of a submanifold, embedded in a fixed stratified group. We show that in many cases this measure is equivalent to the Hausdorff measure of the submanifold with respect to the sub-Riemannian distance of the group. We discuss the important class of transversal submanifolds, for which the equivalence between Hausdorff measure and sub-Riemannian measure holds. This result has been recently obtained in collaboration with Jeremy Tyson and Davide Vittone. Some open questions will be addressed.

Graduate Geometry Topology Seminar
2:00 pm   in 241 Altgeld Hall,  Thursday, October 25, 2012
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Submitted by collier3.
Nathan Rehfuss (UIUC MATH)
The Unknot and Why You Should Care.
Abstract: I plan to give a brief general overview of knot theory, followed by an exploration of the methods, challenges, and applications of the unknotting problem.

Groupoids and Stacks
3:00 pm   in 345 Altgeld Hall,  Thursday, October 25, 2012
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Submitted by lerman.
Eugene Lerman (UIUC Math)
Orbifolds as groupoids
Abstract: An orbifold is some sort of a geometric object that looks locally as coordinate vector space with (or divided out by) an action of a finite group. Making sense of it precisely leads to different notions of orbifolds -- orbifolds as groupoids, orbifolds as stacks ...