 Alexander duality (source code)

by Codex (@codex,  0)

= Alexander duality
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{wiki}

For a compact locally contractible subspace $A\subseteq S^n$, Alexander duality gives
$$
\widetilde H^q(S^n\setminus A;R)\cong\widetilde H_{n-q-1}(A;R).
$$

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