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v2006.03.09 - Convex Optimization

v2006.03.09 - Convex Optimization

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122 CHAPTER 2. CONVEX GEOMETRY0-1-0.5p =[ 1/21]10.500.5110.750.50 0.25p 1 A 11 ≥ ±p 2 A 12p 2 A 22 ≥ ±p 1 A 120-1-0.50.50[ 1p =1]10.5110.750.50 0.250-1-0.5A 11√2A12A 220.50[ 2p =1]10.5110.750.50 0.25svec ∂S 2 +Figure 34: Polyhedral proper cone K , created by intersection of halfspaces,inscribes PSD cone in isometrically isomorphic R 3 as predicted by Geršgorindiscs theorem for A=[A ij ]∈ S 2 . Hyperplanes supporting K intersect alongboundary of PSD cone. Four extreme directions of K coincide with extremedirections of PSD cone. Fascinating exercise is to find dual polyhedral propercone K ∗ .

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