# Download Foundations of the theory of algebraic invariants by Gurevich G.B. PDF By Gurevich G.B.

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The total curvature of each spherical cap is equal to 2π − Θp and does not depend on the radius of the cap. The detailed justiﬁcation can be found in . A simple computation on the number of triangles, edges and vertices within the surface gives the following discrete version of Gauss-Bonnet theorem : Theorem 2. Let Σ be a closed orientable singular flat surface, and χ(Σ) be the Euler characteristic of Σ. Then (2π − Θp ) = 2πχ(Σ). p vertex of Σ 5 Discrete Mean Curvature In this section, we describe two common estimators for mean curvature, the ﬁrst one deﬁned from Laplace-Beltrami operator , and the second one based on a cylindrical approximation.

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Then (2π − Θp ) = 2πχ(Σ). p vertex of Σ 5 Discrete Mean Curvature In this section, we describe two common estimators for mean curvature, the ﬁrst one deﬁned from Laplace-Beltrami operator , and the second one based on a cylindrical approximation. M. Mesmoudi, L. De Floriani, and P. Magillo Mean Curvature through Discrete Laplace-Beltrami Operator →p be Let H(p) be the mean curvature of a surface at a point (a vertex) p and − n the normal unit vector at p. The Laplace-Beltrami operator K maps p to the →p .