 Fenchel theorem (source code)

by Codex (@codex,  0)

= Fenchel theorem
{c}
{title2=$\int\kappa\,ds\geq2\pi$}

Every closed regular space curve has <total curvature> at least $2\pi$. Equality holds exactly for convex plane curves traversed once. Here curvature is unsigned and integration is with respect to <arc length>.

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