Hatcher 2.1.21

Hatcher, Algebraic Topology, Chapter 2, Section 1

21. Making the previous problem more concrete, construct explicit chain maps s:C_n(X)\to C_{n+1}(SX) inducing isomorphisms \widetilde{H}_n(X)\to\widetilde{H}_{n+1}(SX).
Proof.

\square

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