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# Events for 02/15/2019 from all calendars

## Working Seminar on Quantum Groups

## Probability Seminar

## Banach Spaces Seminar

## Presentation of new Math Gamelets

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

## Algebra and Combinatorics Seminar

## Linear Analysis Seminar

**Time:** 10:30AM - 12:30PM

**Location:** BLOC 624

**Speaker:** Priyanga Ganesan, TAMU

**Title:** *Representations of CQG, part II*

**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

**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.

**Time:** 12:00PM - 1:00PM

**Location:** BLOC 220

**Speaker:** TRISEUM

**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*

**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.

**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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