12.07.2015 Views

v2007.11.26 - Convex Optimization

v2007.11.26 - Convex Optimization

v2007.11.26 - Convex Optimization

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406 CHAPTER 6. CONE OF DISTANCE MATRICESdvec rel∂EDM 3d 0 13 0.20.2d 120.40.40.60.60.80.8111d 230.80.60.4d 23(a)0.20(d)d 12d 130.80.8√d23 0.60.6√ √ 0 0 d13 0.20.2 d120.20.20.40.4 0.40.40.60.6 0.60.60.80.8 0.80.811 11110.40.40.20.2(b)00(c)Figure 100: Relative boundary (tiled) of EDM cone EDM 3 drawn truncatedin isometrically isomorphic subspace R 3 . (a) EDM cone drawn in usualdistance-square coordinates d ij . View is from interior toward origin. Unlikepositive semidefinite cone, EDM cone is not self-dual, neither is it properin ambient symmetric subspace (dual EDM cone for this example belongsto isomorphic R 6 ). (b) Drawn in its natural coordinates √ d ij (absolutedistance), cone remains convex (confer5.10); intersection of three halfspaces(896) whose partial boundaries each contain origin. Cone geometry becomes“complicated” (nonpolyhedral) in higher dimension. [134,3] (c) Twocoordinate systems artificially superimposed. Coordinate transformationfrom d ij to √ d ij appears a topological contraction. (d) Sitting onits vertex 0, pointed EDM 3 is a circular cone having axis of revolutiondvec(−E)= dvec(11 T − I) (928) (64). Rounded vertex is plot artifact.

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