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v2007.09.13 - Convex Optimization

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304 CHAPTER 5. EUCLIDEAN DISTANCE MATRIXx 3x 4x 5x 6Figure 76: Arbitrary hexagon in R 3 whose vertices are labelled clockwise.x 1x 2Barvinok’s Proposition 2.9.3.0.1 predicts existence for either formulation(735) or (737) such that implicit equality constraints induced by subspacemembership are ignored⌊√ ⌋8(N(N −1)/2) + 1 − 1rankG , rankV DV ≤= N − 1 (738)2because, in each case, the Gram matrix is confined to a face of positivesemidefinite cone S N + isomorphic with S N−1+ (6.7.1). (E.7.2.0.2) This boundis tight (5.7.1.1) and is the greatest upper bound. 5.85.4.2.2.2 Example. Hexagon.Barvinok [22,2.6] poses a problem in geometric realizability of an arbitraryhexagon (Figure 76) having:1. prescribed (one-dimensional) face-lengths l2. prescribed angles ϕ between the three pairs of opposing faces3. a constraint on the sum of norm-square of each and every vertex x5.8 −V DV | N←1 = 0 (B.4.1)

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