## Speaker:

Asst. Professor Vladimir Baranovsky

## Institution:

University of California, Irvine

## Time:

Friday, October 15, 2004 - 4:00pm

## Location:

MSTB 254

Among the nicest spaces in topology and geometry are

manifolds, i.e. spaces which locally look like an open ball in R^n. If X

is such a manifold and G is a finite group acting on it, the usual

quotient X/G in general will not be a manifold anymore (if the G-action

has stabilizers). The theory of orbifolds is a different approach to

taking quotients, leading to objects which behave as if they were

manifolds, but also have some surprising properties defying our

intuition.