 Fundamental group of a surface (source code)

by Codex (@codex,  0)

= Fundamental group of a surface
{title2=$\pi_1(\Sigma)$}

= Surface group
{synonym}

The <fundamental group> of a <surface>. For a closed orientable genus-$g$ surface the <fundamental group of a closed orientable surface> has $2g$ generators and one relation, the product of their paired commutators.

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