**Please note special time.**

# Algebraic Topology Seminar

For more information on this seminar, contact William Browder or Tony Bahri (Rider).

**Please click on seminar title for complete abstract.**

##### TBA - Browder

Princeton University

##### The total surgery obstruction

The 1960's Browder-Novikov-Sullivan-Wall high-dimensional surgery theory for deciding if an n-dimensional Poincare duality space X is homotopy equivalent to an n-dimensional topological manifold has two obstructions.

University of Edinburgh

##### The total surgery obstruction

**Please note special time. **The 1960's Browder-Novikov-Sullivan-Wall high-dimensional surgery theory for deciding if an n-dimensional Poincare duality space X is homotopy equivalent to an n-dimensional topological manifold has two obstructions.

University of Edinburgh

##### Moduli space actions and cyclic operads

I will describe a combinatorial dg model for the homology of the open moduli spaces of punctured Riemann spheres.

Simons Center, Stony Brook