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v2007.09.13 - Convex Optimization

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5.14. FIFTH PROPERTY OF EUCLIDEAN METRIC 383.Figure 93: Length of one-dimensional face a equals height h=a=1 of thisnonsimplicial pyramid in R 3 with square base inscribed in a circle of radius Rcentered at the origin. [279, Pyramid]5.14.3.2.1 Exercise. Sufficiency for an EDM of five points.For N = 5, triangle (distance) inequality (5.2), area inequality (968), andvolume inequality (973) are conditions necessary for D to be an EDM.Prove their sufficiency.5.14.3.3 Volume of simplicesThere is no known formula for the volume of a bounded general convexpolyhedron expressed either by halfspace or vertex-description. [296,2.1][207, p.173] [167] [168] [122] [123] Volume is a concept germane to R 3 ;in higher dimensions it is called content. Applying the EDM assertion(5.9.1.0.3) and a result given in [46,8.3.1], a general nonempty simplex(2.12.3) in R N−1 corresponding to an EDM D ∈ S N h has content√ c = content(S)√det(−V T N DV N) (974)where the content-squared of the unit simplex S ⊂ R N−1 is proportional toits Cayley-Menger determinant;content(S) 2 =[ ]−1 0 12 N−1 (N −1)! 2 det T1 −D([0 e 1 e 2 · · · e N−1 ])where e i ∈ R N−1 and the EDM operator used is D(X) (705).(975)

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