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单词 SectionalCurvature
释义

sectional curvature


Let M be a Riemannian manifoldMathworldPlanetmath. Let p be a point in M and let S be a two-dimensional subspace of TpM. Then the sectional curvatureMathworldPlanetmath of S at p is defined as

K(S)=g(R(x,y)x,y)g(x,x)g(y,y)-g(x,y)2

where x,y span S, g is the metric tensor and R is the Riemann’s curvature tensor.

This is a natural generalization of the classical Gaussian curvatureMathworldPlanetmath for surfaces.

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更新时间:2025/5/4 4:33:17