The singular cohomology of the inverse limit of a Postnikov tower is representable

Author:

Dydak Jerzy,Geoghegan Ross

Abstract

Let X 1 X 2 {X_1} \leftarrow {X_2} \leftarrow \cdots be an inverse sequence of spaces and maps satisfying (i) each X n {X_n} has the homotopy type of a CW complex, (ii) each f n {f_n} is a Hurewicz fibration, and (iii) the connectivity of the fiber of f n {f_n} goes to \infty with n n . Let X ^ \hat X be the inverse limit of the sequence. It is shown that the natural homomorphism H ˇ k ( X ^ , G ) H k ( X ^ , G ) \check {H}^k(\hat {X},G) \to H^k(\hat {X}, G) (from Čech cohomology to singular cohomology, with ordinary coefficient module G G ) is an isomorphism for all k k . It follows that lim n [ X n , K ( G , k ) ] [ X ^ , K ( G , k ) ] {\lim _{ \to n}}[{X_n},K(G,k)] \cong [\hat X,K(G,k)] for any Eilenberg- Mac Lane space K ( G , k ) K(G,k) . It is also shown that, except in trivial cases, X X does not have the homotopy type of a CW complex.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference10 articles.

1. The Whitehead and the Smale theorems in shape theory;Dydak, Jerzy;Dissertationes Math. (Rozprawy Mat.),1979

2. Lecture Notes in Mathematics, Vol. 542;Edwards, David A.,1976

3. The inverse limit of homotopy equivalences between towers of fibrations is a homotopy equivalence—a simple proof;Geoghegan, Ross;Topology Proc.,1979

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