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v2009.01.01 - Convex Optimization

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488 CHAPTER 6. CONE OF DISTANCE MATRICES<br />

6.8.1.6 EDM cone duality<br />

In5.6.1.1, via Gram-form EDM operator<br />

D(G) = δ(G)1 T + 1δ(G) T − 2G ∈ EDM N ⇐ G ≽ 0 (810)<br />

we established clear connection between the EDM cone and that face (1146)<br />

of positive semidefinite cone S N + in the geometric center subspace:<br />

EDM N = D(S N c ∩ S N +) (912)<br />

V(EDM N ) = S N c ∩ S N + (913)<br />

where<br />

In5.6.1 we established<br />

V(D) = −V DV 1 2<br />

(901)<br />

S N c ∩ S N + = V N S N−1<br />

+ V T N (899)<br />

Then from (1179), (1187), and (1153) we can deduce<br />

δ(EDM N∗ 1) − EDM N∗ = V N S N−1<br />

+ V T N = S N c ∩ S N + (1192)<br />

which, by (912) and (913), means the EDM cone can be related to the dual<br />

EDM cone by an equality:<br />

(<br />

EDM N = D δ(EDM N∗ 1) − EDM N∗) (1193)<br />

V(EDM N ) = δ(EDM N∗ 1) − EDM N∗ (1194)<br />

This means projection −V(EDM N ) of the EDM cone on the geometric<br />

center subspace S N c (E.7.2.0.2) is a linear transformation of the dual EDM<br />

cone: EDM N∗ − δ(EDM N∗ 1). Secondarily, it means the EDM cone is not<br />

self-dual.

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