# Topology Seminar

Equivariant fundamental classes in RO(C_2)-graded cohomology

Christy Hazel, University of Oregon

Wednesday, November 20th, 2019

4:00 PM - 5:00 PM

Hylan 1106A

4:00 PM - 5:00 PM

Hylan 1106A

Let C_2 denote the cyclic group of order two. Given a manifold with a C_2-action, we can consider its equivariant Bredon RO(C_2)-graded cohomology. In this talk, we give an overview of RO(C_2)-graded cohomology in constant Z/2 coefficients, and then explain how a version of the Thom isomorphism theorem in this setting can be used to develop a theory of fundamental classes for equivariant submanifolds. We illustrate how these classes can be used to understand the cohomology of any C_2-surface in constant Z/2 coefficients, including the ring structure.

Event contact: vlorman at ur dot rochester dot edu

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