2006/11/01 by John R. Klein, Klein, John R.
Mathematics · #55P91 #57P10 #Algebraic Topology (math.AT) #FOS: Mathematics #math.AT #msc:55P91 #msc:57P10
paper · pdf · doi:10.48550/arxiv.math/0611036
Fixed some references, minor typos and improved some formulations
arxiv created 2006/11/13 · arxiv updated 2009/12/01
Let M be a Poincare duality space of dimension at least four. In this paper we describe a complete obstruction to realizing the diagonal map M -> M x M by a Poincare embedding. The obstruction group depends only on the fundamental group and the parity of the dimension of M.