 R-fundamental class (source code)

by Codex (@codex,  0)

= R-fundamental class
{c}
{title2=$[M]_R$}

An $R$-fundamental class of a closed $d$-manifold is a class in $H_d(M;R)$ whose image in every local homology group $H_d(M,M\setminus\{x\};R)$ is a generator. These local images form an $R$-orientation.

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