# Events for 11/01/2021 from all calendars

## Geometry Seminar

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

**Location: ** BLOC 302

**Speaker: **John Berman, University of Massachusetts Amherst

**Title: ***Measuring Ramification with Topological Hochschild Homology*

**Abstract: **Topological Hochschild homology (THH) has recently been popular as an approximation to algebraic K-theory, but it is also a measure of ramification in the sense of number theory. I will survey the interaction between THH and ramification / etale extensions, along with some surprising connections to classical algebraic topology. This will culminate in a new computation of THH of any ring of integers R, suggesting the philosophy: Spec(R) -> Spec(Z) is one point away from being etale.

## Faculty Meeting

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

**Location: ** Bloc 117, Zoom