It is a basic question but I'm stuck.
If $p:M\rightarrow N$ is a $m$-fold unramified covering between surfaces, why the morphism induced by $p$ in cohomology at level 2 with coefficients in $\mathbb{Z}/m$ is zero?
2026-03-29 14:02:42.1774792962
Morphism induced in cohomology of a covering space
422 Views Asked by Bumbble Comm https://math.techqa.club/user/bumbble-comm/detail AtRelated Questions in ALGEBRAIC-TOPOLOGY
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