# Events for 02/15/2019 from all calendars

## Working Seminar on Quantum Groups

Time: 10:30AM - 12:30PM

Location: BLOC 624

Speaker: Priyanga Ganesan, TAMU

Title: Representations of CQG, part II

## Probability Seminar

Time: 11:00AM - 12:00PM

Location: BLOC 628

Speaker: Petros Valettas, University of Missouri

Title: Gaussian concentration and convexity

Abstract: We will discuss new forms of concentration and anti-concentration phenomena explained by convexity rather than isoperimetry. On the side of applications, this perspective allows for superconcentration and convexity to be melted together in order to obtain strong small ball and small deviation estimates in normed spaces. In this framework, the $\ell_\infty$-structure arises naturally as the (approximate) extremal. The underlying principle dictating these phenomena is rooted in the sensitivity of the variance. Based on a joint work with G. Paouris and K. Tikhomirov

## Banach Spaces Seminar

Time: 11:00AM - 12:00PM

Location: BLOC 628

Speaker: Petros Valettas, University of Missouri

Title: Gaussian concentration and convexity

Abstract: We will discuss new forms of concentration and anti-concentration phenomena explained by convexity rather than isoperimetry. On the side of applications, this perspective allows for superconcentration and convexity to be melted together in order to obtain strong small ball and small deviation estimates in normed spaces. In this framework, the l-structure arises naturally as the (approximate) extremal. The underlying principle dictating these phenomena is rooted in the sensitivity of the variance. Based on a joint work with G. Paouris and K. Tikhomirov.

## Presentation of new Math Gamelets

Time: 12:00PM - 1:00PM

Location: BLOC 220

Speaker: TRISEUM

## Working Seminar in Groups, Dynamics, and Operator Algebras

Time: 2:00PM - 2:00PM

Location: BLOC 628

Speaker: Xin Ma, Texas A&M University

Title: Topological full groups of one-sided shifts of finite type IX

## Algebra and Combinatorics Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 628

Speaker: Galen Dorpalen-Barry, University of Minnesota

Title: Whitney Numbers for Cones

Abstract: An arrangement of hyperplanes dissects space into connected components called chambers. A nonempty intersection of halfspaces from the arrangement will be called a cone.  The number of chambers of the arrangement lying within the cone is counted by a theorem of Zaslavsky, as a sum of certain nonnegative integers that we will call the cone's "Whitney numbers of the 1st kind".  For cones inside the reflection arrangement of type A (the braid arrangement), cones correspond to posets, chambers in the cone correspond to linear extensions of the poset, and these Whitney numbers refine the number of linear extensions.  We present some basic facts about these Whitney numbers, and interpret them for two families of posets.

## Linear Analysis Seminar

Time: 4:00PM - 5:00PM

Location: BLOC 220

Speaker: Michiya Mori, University of Tokyo

Title: Isometries between substructures of operator algebras II

Abstract: I will explain further details about the talk one week before, in particular on Tingley's problem for operator algebras.

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