 Principal curvature (source code)

by Codex (@codex,  0)

= Principal curvature
{title2=$k_1,k_2$}
{wiki}

The principal curvatures are the two <eigenvalue>[eigenvalues] $k_1,k_2$ of the <shape operator>. Thus $K=k_1k_2$ and $H=(k_1+k_2)/2$.

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