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v2007.09.13 - Convex Optimization

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v2007.09.13 - Convex Optimization

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5.4. EDM DEFINITION 301D ∈ EDM N⇔{−VTN DV N ∈ S N−1+D ∈ S N h(724)We provide a rigorous complete more geometric proof of this Schoenbergcriterion in5.9.1.0.3.[ ] 0 0TBy substituting G =0 −VN TDV (722) into D(G) (717), assumingNx 1 = 0[0D =δ ( −VN TDV )N] [1 T + 1 0 δ ( ) ]−VNDV T TNWe provide details of this bijection in5.6.2.[ ] 0 0T− 20 −VN TDV N(725)5.4.2.2 0 geometric centerAssume the geometric center (5.5.1.0.1) of an unknown list X is the origin;X1 = 0 ⇔ G1 = 0 (726)Now consider the calculation (I − 1 N 11T )D(G)(I − 1 N 11T ) , a geometriccentering or projection operation. (E.7.2.0.2) Setting D(G) = D forconvenience as in5.4.2.1,G = − ( D − 1 N (D11T + 11 T D) + 1N 2 11 T D11 T) 12 , X1 = 0= −V DV 1 2V GV = −V DV 1 2∀X(727)where more properties of the auxiliary (geometric centering, projection)matrixV ∆ = I − 1 N 11T ∈ S N (728)are found inB.4. From (727) and the assumption D ∈ S N h we get sufficiencyof the more popular form of Schoenberg’s criterion:

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