# Events for 09/02/2020 from all calendars

## JD Kim Promotion Talk

**Time: ** 1:00PM - 2:00PM

**Location: ** Zoom

**Speaker: **JD Kim

## Noncommutative Geometry Seminar

**Time: ** 1:00PM - 2:00PM

**Location: ** Zoom 942810031

**Speaker: **Bruno de Mendonca Braga, University of Virginia

**Title: ***Coarse equivalences of metric spaces and outer automorphisms of Roe algebras*

**Abstract: **Given a metric space $X$, the Roe algebra of $X$, denoted by $\mathrm{C}^*(X)$, is a $ \mathrm{C} ^*$-algebra which encodes many of $X$'s large scale geometric properties. In this talk, I will discuss some uniform approximability results for maps between Roe algebras (we call those "coarse-like properties"). I will then talk about applications of these uniform approximability results to isomorphisms between Roe algebras. In particular, given a uniformly locally finite metric space $X$, we obtain that the canonical map from the group of coarse equivalences of $X$ modulo the relation of closeness to the group of outer automorphisms of $ \mathrm{C} ^*(X)$ is surjective if $X$ has property A. This is a joint work with Alessandro Vignati.

**URL: ***Event link*