## Dynamics, Geometry, & Groups Seminar

### Thursday, January 14th, 2021

**Time:** 1:30 p.m** Place:**

**Speaker:** Hakan Doga (SUNY Buffalo)

**Title:** A Combinatorial Description of the Knot Concordance Invariant Epsilon.

**Abstract:** Sitting at the intersection of 4-dimensional topology and knot theory, the knot concordance group is an important object in low-dimensional topology whose structure is not yet fully explored and understood. One approach to study knot concordance is to use knot Floer homology, introduced by Ozsvath-Szabo and Rasmussen independently in early 2000s, and the invariants obtained from this theory. In this talk, I will describe the knot concordance, introduce some basic definitions of the combinatorial knot Floer homology called the "grid homology", explain our method of computing the concordance invariant epsilon and talk about some results. This is a joint work with S. Dey.