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v2010.10.26 - Convex Optimization

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5.14. FIFTH PROPERTY OF EUCLIDEAN METRIC 4955.14.4.1 Exemplum reduxWe now apply the fifth Euclidean metric property to an earlier problem:5.14.4.1.1 Example. Small completion problem, IV. (confer5.9.3.0.1)Returning again to Example 5.3.0.0.2 that pertains to Figure 116 whereN =4, distance-square d 14 is ascertainable from the fifth Euclidean metricproperty. Because all distances in (883) are known except √ d 14 , thencos θ 123 =0 and θ 324 =0 result from identity (954). Applying (885),cos(θ 123 + θ 324 ) ≤ cosθ 124 ≤ cos(θ 123 − θ 324 )0 ≤ cos θ 124 ≤ 0(1174)It follows again from (954) that d 14 can only be 2. As explained in thissubsection, affine dimension r cannot exceed N −2 because equality isattained in (1174).

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