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写在前面
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问题说明
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二维证明
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三维证明
参考资料
A Proof that the Divergence of a Surface Normal Is Equal to the sum of the Principal Curvatures
https://willson.cm.utexas.edu/Research/Sub_Files/Surface_Phenomena/Spring%202000/surface_normal_proof.pdf#:~:text=Then%20in%20t%20w%20o%20dimensions%2C%20the%20div,to%20surface%20is%20equal%20sum%20principal%20curv%20atures.
Nicholas M. Patrikalakis, Takashi Maekawa, Wonjoon Cho. Shape Interrogation for Computer Aided Design and Manufacturing:Principal normal and curvature
https://web.mit.edu/hyperbook/Patrikalakis-Maekawa-Cho/node23.html
Nicholas M. Patrikalakis, Takashi Maekawa, Wonjoon Cho. Shape Interrogation for Computer Aided Design and Manufacturing:Curvature and curvature vector
https://web.mit.edu/hyperbook/Patrikalakis-Maekawa-Cho/node119.html#sec:dgint_trans_curv
请问如何根据二阶导判断函数凹凸性?
https://www.zhihu.com/question/349019716
Relation between divergence of unit normal and radius of curvature
https://physics.stackexchange.com/questions/698035/relation-between-divergence-of-unit-normal-and-radius-of-curvature
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