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v2009.01.01 - Convex Optimization

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

svec ∂ S 2 +<br />

[ ]<br />

d11 d 12<br />

d 12 d 22<br />

d 22<br />

svec EDM 2<br />

0<br />

−T<br />

d 11<br />

√<br />

2d12<br />

T ∆ =<br />

{<br />

[ 1<br />

svec(zz T ) | z ∈ N(11 T )= κ<br />

−1<br />

] }<br />

, κ∈ R ⊂ svec ∂ S 2 +<br />

Figure 122: Truncated boundary of positive semidefinite cone S 2 + in<br />

isometrically isomorphic R 3 (via svec (49)) is, in this dimension, constituted<br />

solely by its extreme directions. Truncated cone of Euclidean distance<br />

matrices EDM 2 in isometrically isomorphic subspace R . Relative<br />

boundary of EDM cone is constituted solely by matrix 0. Halfline<br />

T = {κ 2 [ 1 − √ 2 1 ] T | κ∈ R} on PSD cone boundary depicts that lone<br />

extreme ray (1143) on which orthogonal projection of −D must be positive<br />

semidefinite if D is to belong to EDM 2 . aff cone T = svec S 2 c . (1148) Dual<br />

EDM cone is halfspace in R 3 whose bounding hyperplane has inward-normal<br />

svec EDM 2 .

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