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v2007.11.26 - Convex Optimization

v2007.11.26 - Convex Optimization

v2007.11.26 - Convex Optimization

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4.1. CONIC PROBLEM 229C0PΓ 1Γ 2S+3A=∂HFigure 64: Visualizing positive semidefinite cone in high dimension: Properpolyhedral cone S 3 + ⊂ R 3 representing positive semidefinite cone S 3 + ⊂ S 3 ;analogizing its intersection with hyperplane S 3 + ∩ ∂H . Number of facetsis arbitrary (analogy is not inspired by eigen decomposition). The rank-0positive semidefinite matrix corresponds to the origin in R 3 , rank-1 positivesemidefinite matrices correspond to the edges of the polyhedral cone, rank-2to the facet relative interiors, and rank-3 to the polyhedral cone interior.Vertices Γ 1 and Γ 2 are extreme points of polyhedron P =∂H ∩ S 3 + , andextreme directions of S 3 + . A given vector C is normal to another hyperplane(not illustrated but independent w.r.t ∂H) containing line segment Γ 1 Γ 2minimizing real linear function 〈C , X〉 on P . (confer Figure 19)

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