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v2009.01.01 - Convex Optimization

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10 CONVEX OPTIMIZATION & EUCLIDEAN DISTANCE GEOMETRY<br />

4 Semidefinite programming 245<br />

4.1 Conic problem . . . . . . . . . . . . . . . . . . . . . . . . . . . 246<br />

4.2 Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254<br />

4.3 Rank reduction . . . . . . . . . . . . . . . . . . . . . . . . . . 268<br />

4.4 Rank-constrained semidefinite program . . . . . . . . . . . . . 277<br />

4.5 Constraining cardinality . . . . . . . . . . . . . . . . . . . . . 294<br />

4.6 Cardinality and rank constraint examples . . . . . . . . . . . . 308<br />

4.7 <strong>Convex</strong> Iteration rank-1 . . . . . . . . . . . . . . . . . . . . . 340<br />

5 Euclidean Distance Matrix 345<br />

5.1 EDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346<br />

5.2 First metric properties . . . . . . . . . . . . . . . . . . . . . . 347<br />

5.3 ∃ fifth Euclidean metric property . . . . . . . . . . . . . . . . 347<br />

5.4 EDM definition . . . . . . . . . . . . . . . . . . . . . . . . . . 352<br />

5.5 Invariance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382<br />

5.6 Injectivity of D & unique reconstruction . . . . . . . . . . . . 387<br />

5.7 Embedding in affine hull . . . . . . . . . . . . . . . . . . . . . 393<br />

5.8 Euclidean metric versus matrix criteria . . . . . . . . . . . . . 398<br />

5.9 Bridge: <strong>Convex</strong> polyhedra to EDMs . . . . . . . . . . . . . . . 406<br />

5.10 EDM-entry composition . . . . . . . . . . . . . . . . . . . . . 413<br />

5.11 EDM indefiniteness . . . . . . . . . . . . . . . . . . . . . . . . 416<br />

5.12 List reconstruction . . . . . . . . . . . . . . . . . . . . . . . . 424<br />

5.13 Reconstruction examples . . . . . . . . . . . . . . . . . . . . . 428<br />

5.14 Fifth property of Euclidean metric . . . . . . . . . . . . . . . 435<br />

6 Cone of distance matrices 445<br />

6.1 Defining EDM cone . . . . . . . . . . . . . . . . . . . . . . . . 447<br />

6.2<br />

√<br />

Polyhedral bounds . . . . . . . . . . . . . . . . . . . . . . . . 449<br />

6.3 EDM cone is not convex . . . . . . . . . . . . . . . . . . . . 451<br />

6.4 a geometry of completion . . . . . . . . . . . . . . . . . . . . . 452<br />

6.5 EDM definition in 11 T . . . . . . . . . . . . . . . . . . . . . . 458<br />

6.6 Correspondence to PSD cone S N−1<br />

+ . . . . . . . . . . . . . . . 466<br />

6.7 Vectorization & projection interpretation . . . . . . . . . . . . 472<br />

6.8 Dual EDM cone . . . . . . . . . . . . . . . . . . . . . . . . . . 477<br />

6.9 Theorem of the alternative . . . . . . . . . . . . . . . . . . . . 491<br />

6.10 postscript . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493

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