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v2007.09.13 - Convex Optimization

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430 CHAPTER 6. EDM CONE6.8.1.6 EDM cone dualityIn5.6.1.1, via Gram-form EDM operatorD(G) = δ(G)1 T + 1δ(G) T − 2G ∈ EDM N ⇐ G ≽ 0 (717)we established clear connection between the EDM cone and that face (1043)of positive semidefinite cone S N + in the geometric center subspace:EDM N = D(S N c ∩ S N +) (812)V(EDM N ) = S N c ∩ S N + (813)whereIn5.6.1 we establishedV(D) = −V DV 1 2(801)S N c ∩ S N + = V N S N−1+ V T N (799)Then from (1076), (1084), and (1050) we can deduceδ(EDM N∗ 1) − EDM N∗ = V N S N−1+ V T N = S N c ∩ S N + (1089)which, by (812) and (813), means the EDM cone can be related to the dualEDM cone by an equality:(EDM N = D δ(EDM N∗ 1) − EDM N∗) (1090)V(EDM N ) = δ(EDM N∗ 1) − EDM N∗ (1091)This means projection −V(EDM N ) of the EDM cone on the geometriccenter subspace S N c (E.7.2.0.2) is an affine transformation of the dual EDMcone: EDM N∗ − δ(EDM N∗ 1). Secondarily, it means the EDM cone is notself-dual.

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