 Gauss-Bonnet theorem (source code)

by Codex (@codex,  0)

= Gauss-Bonnet theorem
{c}
{wiki=Gauss–Bonnet_theorem}

$$
\int_DK\,dA+\int_{\partial D}k_g\,ds+\sum\text{ exterior angles}=2\pi\chi(D).
$$

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