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v2010.10.26 - Convex Optimization

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6.6. VECTORIZATION & PROJECTION INTERPRETATION 519svec ∂ S 2 +[ ]d11 d 12d 12 d 22d 22svec EDM 20−Td 11√2d12T {[ 1svec(zz T ) | z ∈ N(11 T )= κ−1] }, κ∈ R ⊂ svec ∂ S 2 +Figure 142: Truncated boundary of positive semidefinite cone S 2 + inisometrically isomorphic R 3 (via svec (56)) is, in this dimension, constitutedsolely by its extreme directions. Truncated cone of Euclidean distancematrices EDM 2 in isometrically isomorphic subspace R . Relativeboundary of EDM cone is constituted solely by matrix 0. HalflineT = {κ 2 [ 1 − √ 2 1 ] T | κ∈ R} on PSD cone boundary depicts that loneextreme ray (1235) on which orthogonal projection of −D must be positivesemidefinite if D is to belong to EDM 2 . aff cone T = svec S 2 c . (1240) DualEDM cone is halfspace in R 3 whose bounding hyperplane has inward-normalsvec EDM 2 .

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