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v2009.01.01 - Convex Optimization

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2.9. POSITIVE SEMIDEFINITE (PSD) CONE 113<br />

belong to relative interior of a face having dimension 1 , 2.36 and the only<br />

rank-0 matrix is the point at the origin (the zero-dimensional face).<br />

Any simultaneously diagonalizable positive semidefinite rank-k matrices<br />

belong to the same face (203). That observation leads to the following<br />

hyperplane characterization of PSD cone faces: Any rank-k

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