## Topology & Geometric Group Theory Seminar

## Fall 2007

### 1:30 - 2:30

Thursday, November 15, Malott 251

**Tony
Bahri**, Rider University

*Piecewise polynomials and the equivariant cohomology of weighted
projective spaces*

A report of joint work with Matthias Franz and Nigel Ray.

As toric varieties, weighted projective spaces have a natural torus
action. We describe the integral equivariant cohomology ring, with
respect to this action, in terms of piecewise polynomial functions on
the underlying fan. Unlike the ordinary integral cohomology, this
ring distinguishes among weighted projective spaces.

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