 Mapping class group (source code)

by Codex (@codex,  0)

= Mapping class group
{title2=$\operatorname{Mod}(S)$}
{wiki}

The mapping class group $\operatorname{Mod}(S)$ of an oriented surface $S$ is the group of orientation-preserving self-homeomorphisms of $S$ modulo <isotopy>. It acts on isotopy classes of curves and arcs.

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