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Cohomology of Constant Sheaves

  • Torsten Wedhorn
Chapter
Part of the Springer Studium Mathematik - Master book series (SSMM)

Abstract

In this chapter we focus on cohomology of constant sheaves. We start by defining singular (co)homology and then show that for a locally contractible space X singular cohomology with values in a ring R and the cohomology of the constant sheaf R X are equal. We deduce that R X is acyclic if X is contractible and locally contractible.

Combining this result for \(X=[0,1]\) and the proper base change theorem we deduce homotopy invariance of cohomology of constant sheaves for continuous maps between arbitrary topological spaces in Sect. 11.3. We conclude the chapter with some easy applications.

Notation: Let R always be a commutative ring and let X be a topological space.

Keywords

Topological Space Commutative Ring Homotopy Invariance Contractible Space Sheaf Cohomology 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Fachmedien Wiesbaden 2016

Authors and Affiliations

  1. 1.Technische Universität DarmstadtDarmstadtGermany

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