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v2009.01.01 - Convex Optimization

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5.3. ∃ FIFTH EUCLIDEAN METRIC PROPERTY 349<br />

x 3<br />

x 4<br />

x 3<br />

x 4<br />

(a)<br />

√<br />

5<br />

1<br />

2<br />

(b)<br />

1<br />

x 1 1 x 2<br />

x 1 x 2<br />

Figure 93: (a) Complete dimensionless EDM graph. (b) Emphasizing<br />

obscured segments x 2 x 4 , x 4 x 3 , and x 2 x 3 , now only five (2N −3) absolute<br />

distances are specified. EDM so represented is incomplete, missing d 14 as<br />

in (790), yet the isometric reconstruction (5.4.2.2.6) is unique as proved in<br />

5.9.3.0.1 and5.14.4.1.1. First four properties of Euclidean metric are not<br />

a recipe for reconstruction of this polyhedron.<br />

We will return to this simple Example 5.3.0.0.2 to illustrate more elegant<br />

methods of solution in5.8.3.1.1,5.9.3.0.1, and5.14.4.1.1. Until then, we<br />

can deduce some general principles from the foregoing examples:<br />

Unknown d ij of an EDM are not necessarily uniquely determinable.<br />

The triangle inequality does not produce necessarily tight bounds. 5.4<br />

Four Euclidean metric properties are insufficient for reconstruction.<br />

5.4 The term tight with reference to an inequality means equality is achievable.

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