**BİLKENT
ALGEBRA **

TOPOLOGY SEMINAR

**"Equivariant
Homotopy Diagrams III"**

By

# ÖZGÜN ÜNLÜ

# (Bilkent University)

**Abstract:** This talk is about a joint work with Aslı
Güçlükan İlhan. We will
first explain what we mean by an equivariant homotopy diagram. Then we will discuss obstructions to
making these diagrams more and more highly commutative and their rectifications
by equivariant enriched double bar construction. As
an application we will consider some cases where these obstructions vanish and
the rectifications can be used to construct group actions on products of
spheres.

**Date: ****Monday, April 29, 2013**

**Time: ****13.40-14.30**

**Place: ****Mathematics Seminar Room,
SA-141**

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**All are most cordially invited.**

Tea and cookies will be served after the talk.