Cellular Subcomplexes of Piecewise-Linear Manifolds
Richard E. Chandler · Proceedings of the American Mathematical Society · 1965
Let K be a finite cellular subcomplex of a piecewise-linear (combinatorial) n-manifold, Mn, and let N be a regular neighborhood of K in M".Lemma 1. K is contractible.Proof.That K is homologically trivial is an easy application of Cech homology theory.We prove iriiK) = 1.There is an «-cell B such