# Events for 09/23/2019 from all calendars

## Working Seminar on Quantum Computation and Quantum Information

**Time:** 12:30PM - 1:30PM

**Location:** Bloc 624

**Speaker:** John Weeks, TAMU

**Title:** *The embedding theorem*

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

**Time:** 2:00PM - 3:00PM

**Location:** BLOC 628

**Speaker:** Diego Martinez, Texas A&M University

**Title:** *Amenable traces and quasidiagonality*

## Robin Tucker-Drob Promotion Talk

**Time:** 4:00PM - 5:00PM

**Location:** BLOC 220

**Speaker:** Robin Tucker-Drob Promotion Talk, Texas A&M University

**Description:**

.Title: Measure equivalence, superrigidity, and weak Pinsker entropy

Abstract:Measure Equivalence is an equivalence relation on countable groups introduced by Gromov as a measure-theoretic counterpart to the relation of quasi-isometry coming from geometric group theory. In the first part of this talk I will give an introduction to measure equivalence, focusing on examples and open problems. In the second part of the talk I will explain Popa's Cocycle Superrigidity Theorem and discuss work with Lewis Bowen in which we show that the collection of groups which satisfy the conclusion of Popa's Theorem is invariant under measure equivalence. I will also indicate some consequences of our result to a new notion of entropy called weak Pinsker entropy.