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v2009.01.01 - Convex Optimization

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

(b)<br />

(c)<br />

dvec rel∂EDM 3<br />

(a)<br />

∂H<br />

0<br />

Figure 115: (a) In isometrically isomorphic subspace R 3 , intersection of<br />

EDM 3 with hyperplane ∂H representing one fixed symmetric entry d 23 =κ<br />

(both drawn truncated, rounded vertex is artifact of plot). EDMs in this<br />

dimension corresponding to affine dimension 1 comprise relative boundary of<br />

EDM cone (6.6). Since intersection illustrated includes a nontrivial subset<br />

of cone’s relative boundary, then it is apparent there exist infinitely many<br />

EDM completions corresponding to affine dimension 1. In this dimension it is<br />

impossible to represent a unique nonzero completion corresponding to affine<br />

dimension 1, for example, using a single hyperplane because any hyperplane<br />

supporting relative boundary at a particular point Γ contains an entire ray<br />

{ζΓ | ζ ≥0} belonging to rel∂EDM 3 by Lemma 2.8.0.0.1. (b) d 13 =κ.<br />

(c) d 12 =κ.

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