# Research

## Differential Geometry

### Friday, February 7, 2020

Title: Convexity in the Heisenberg Group
Speaker: Zachary Forrest
Time: 12:00pm‐1:00pm
Place: CMC 109

#### Abstract

Convexity in the Euclidean setting plays an integral role in the study of homogeneous, proper, degenerate-elliptic partial differential operators of second-order (e.g. the Laplacian, infinity-Laplacian, $$p$$-Laplacian, and many more examples). Indeed, Euclidean convexity may be equivalently stated in terms of certain weak subsolutions of such equations. We will utilize these equivalencies in $$R^n$$ as a starting point for inquiry into appropriate notions of convexity in the Heisenberg group and, time permitting, general Carnot groups. We will tour the work of Lu, Manfredi, and Stroffolini (2003) and Juutinen, Lu, Manfredi, and Stroffolini (2007), with particular emphasis on the relationships between the various notions of convexity explored in these papers.