 Relative homology (source code)

by Codex (@codex,  0)

= Relative homology
{title2=$H_*(X,A)$}
{wiki}

The relative chain complex is $C_*(X,A)=C_*(X)/C_*(A)$, and its homology is the relative homology $H_*(X,A)$. A pair $A\subseteq U\subseteq X$ produces a long exact sequence for the triple.

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