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v2007.09.13 - Convex Optimization

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6.7. VECTORIZATION & PROJECTION INTERPRETATION 417svec ∂ S 2 +[ ]d11 d 12d 12 d 22d 22svec S 2 h−D0D−Td 11√2d12Projection of vectorized −D on range of vectorized zz T :P svec zz T(svec(−D)) = 〈zzT , −D〉〈zz T , zz T 〉 zzTD ∈ EDM N⇔{〈zz T , −D〉 ≥ 0 ∀zz T | 11 T zz T = 0D ∈ S N h(1037)Figure 103: Given-matrix D is assumed to belong to symmetric hollowsubspace S 2 h ; a line in this dimension. Negating D , we find its polar alongS 2 h . Set T (1038) has only one ray member in this dimension; not orthogonalto S 2 h . Orthogonal projection of −D on T (indicated by half dot) hasnonnegative projection coefficient. Matrix D must therefore be an EDM.

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