Could you help me about differential geometry? I can not prove the following proposition.
Let $M$ be a surface. Prove that if the asymptotic curves of $M$ are orthogonal then $M$ is minimal.
2026-03-28 05:23:13.1774675393
Let $M$ be a surface. Prove that if the asymptotic curves of $M$ are orthogonal then $M$ is minimal.
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