Algebraic Topology · Problem 3.1.2

Cohomology — Allen Hatcher

Mathematics — Topology · ext-multiplication-by-n

Problem

Show that the maps G→nGG \xrightarrow{n} G and H→nHH \xrightarrow{n} H multiplying each element by the integer nn induce multiplication by nn in Ext(H,G)\text{Ext}(H, G).

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