Principal curvature
Maximal and minimal curvature at a point of a surface / From Wikipedia, the free encyclopedia
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In differential geometry, the two principal curvatures at a given point of a surface are the maximum and minimum values of the curvature as expressed by the eigenvalues of the shape operator at that point. They measure how the surface bends by different amounts in different directions at that point.
Maximal and minimal curvature at a point of a surface