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v2009.01.01 - Convex Optimization

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5.14. FIFTH PROPERTY OF EUCLIDEAN METRIC 443<br />

5.14.4.1 Exemplum redux<br />

We now apply the fifth Euclidean metric property to an earlier problem:<br />

5.14.4.1.1 Example. Small completion problem, IV. (confer5.9.3.0.1)<br />

Returning again to Example 5.3.0.0.2 that pertains to Figure 93 where<br />

N =4, distance-square d 14 is ascertainable from the fifth Euclidean metric<br />

property. Because all distances in (790) are known except √ d 14 , then<br />

cos θ 123 =0 and θ 324 =0 result from identity (859). Applying (792),<br />

cos(θ 123 + θ 324 ) ≤ cos θ 124 ≤ cos(θ 123 − θ 324 )<br />

0 ≤ cos θ 124 ≤ 0<br />

(1079)<br />

It follows again from (859) that d 14 can only be 2. As explained in this<br />

subsection, affine dimension r cannot exceed N −2 because equality is<br />

attained in (1079).

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