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v2009.01.01 - Convex Optimization

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360 CHAPTER 5. EUCLIDEAN DISTANCE MATRIX<br />

x 3<br />

x 4<br />

x 5<br />

x 6<br />

Figure 95: Arbitrary hexagon in R 3 whose vertices are labelled clockwise.<br />

x 1<br />

x 2<br />

Barvinok’s Proposition 2.9.3.0.1 predicts existence for either formulation<br />

(828) or (830) such that implicit equality constraints induced by subspace<br />

membership are ignored<br />

⌊√ ⌋<br />

8(N(N −1)/2) + 1 − 1<br />

rankG , rankV DV ≤<br />

= N − 1 (831)<br />

2<br />

because, in each case, the Gram matrix is confined to a face of positive<br />

semidefinite cone S N + isomorphic with S N−1<br />

+ (6.7.1). (E.7.2.0.2) This bound<br />

is tight (5.7.1.1) and is the greatest upper bound. 5.8<br />

5.4.2.2.2 Example. Hexagon.<br />

Barvinok [24,2.6] poses a problem in geometric realizability of an arbitrary<br />

hexagon (Figure 95) having:<br />

1. prescribed (one-dimensional) face-lengths l<br />

2. prescribed angles ϕ between the three pairs of opposing faces<br />

3. a constraint on the sum of norm-square of each and every vertex x<br />

5.8 −V DV | N←1 = 0 (B.4.1)

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