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v2010.10.26 - Convex Optimization

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2.9. POSITIVE SEMIDEFINITE (PSD) CONE 123For the positive semidefinite cone S 2 + in isometrically isomorphic R 3depicted in Figure 43, rank-2 matrices belong to the interior of that facehaving dimension 3 (the entire closed cone), rank-1 matrices belong torelative interior of a face having dimension 2.40 1, and the only rank-0 matrixis the point at the origin (the zero-dimensional face).2.9.2.3.2 Exercise. Bijective isometry.Prove that the smallest face of positive semidefinite cone S M + , containing aparticular full-rank matrix A having ordered diagonalization QΛQ T , is theentire cone: id est, prove Q S M + Q T = S M + from (221).2.9.2.4 rank-k face of PSD coneAny rank-k

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