# Events for 03/01/2023 from all calendars

## Noncommutative Geometry Seminar

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

**Location: ** BLOC 302

**Speaker: **Bo Zhu, TAMU

**Title: ***Metric structure of Riemannian manifolds involving their curvature II*

## Groups and Dynamics Seminar

**Time: ** 3:00PM - 4:00PM

**Location: ** BLOC 302

**Speaker: **Frank Lin, Texas A&M University

**Title: ***Entropy and quantitative orbit equivalence*

**Abstract: **In the setting of probability measure preserving group actions,
two systems are orbit equivalent if their orbits can be matched almost
everywhere in a measurable fashion. Orbit equivalence is much weaker than
measure conjugacy in general, but various authors have shown that entropy
is invariant under certain stronger notions of quantitative orbit
equivalence. We introduce some of these results, including (in joint work
with Lewis Bowen) the invariance of the f-invariant- a generalization of
Kolmogorov-Sinai entropy to actions of free groups - under bounded orbit
equivalence.