Hatcher-Algebraic-Topology · Problem 3.1.12

Cohomology

Mathematics — Graph Theory · relative-cohomology-skeleton-vanishing

Problem

Show Hk(X,Xn;G)=0H^k(X, X^n; G) = 0 if XX is a CW complex and k≤nk \leq n, by using the cohomology version of the second proof of the corresponding result for homology in Lemma 2.34.

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