Topology Seminar

Title: Local algebraic structures and topological manifolds
Speaker: Nathaniel Rounds
Speaker Info: Purdue
Brief Description:
Special Note:

Can we associate an algebraic structure to a manifold such that this structure up to equivalence determines the manifold up to homeomorphism? If we replace the word "homeomorphism" with the word "homotopy equivalence", the answer is yes. We will describe various algebraic structures on a manifold's chains and cochains, all of which are known to be homotopy invariant. We will suggest, however, that the missing idea is that of algebraic locality. The various algebraic structures that we associate to a manifold are all local in an appropriate sense, but the inverse to the Poincare duality map need not be local. We will show, using Ranicki's algebraic surgery, that considering the inverse to the Poincare duality map leads to a topological invariant of manifolds. We will end with a conjectural synthesis of all these ideas which gives an affirmative answer to the opening question.
Date: Monday, April 4, 2011
Time: 4:10pm
Where: Lunt 104
Contact Person: Prof. Paul Goerss
Contact email: pgoerss@math.northwestern.edu
Contact Phone: 847-491-8544
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