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v2009.01.01 - Convex Optimization

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Chapter 6<br />

Cone of distance matrices<br />

For N > 3, the cone of EDMs is no longer a circular cone and<br />

the geometry becomes complicated...<br />

−Hayden, Wells, Liu, & Tarazaga (1991) [159,3]<br />

In the subspace of symmetric matrices S N , we know that the convex cone of<br />

Euclidean distance matrices EDM N (the EDM cone) does not intersect the<br />

positive semidefinite cone S N + (PSD cone) except at the origin, their only<br />

vertex; there can be no positive nor negative semidefinite EDM. (1004) [202]<br />

EDM N ∩ S N + = 0 (1080)<br />

Even so, the two convex cones can be related. In6.8.1 we prove the equality<br />

EDM N = S N h ∩ ( )<br />

S N⊥<br />

c − S N + (1173)<br />

2001 Jon Dattorro. CO&EDG version 2009.01.01. All rights reserved.<br />

Citation: Jon Dattorro, <strong>Convex</strong> <strong>Optimization</strong> & Euclidean Distance Geometry,<br />

Meboo Publishing USA, 2005.<br />

445

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