# University of Toronto's Symplectic Geometry Seminar

Nov. 28 2002, 3pm

SS1078

## Reyer Sjamaar

###
Cornell University

##
A de Rham theorem for symplectic quotients

** Abstract: **
We introduce a de Rham model for stratified spaces arising
from symplectic reduction. It turns out that the reduced symplectic
form and its powers give rise to well-defined cohomology classes (in
ordinary cohomology theory with real coefficients), even on a singular
symplectic quotient. These classes are nonzero if the quotient is
compact.