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v2007.09.13 - Convex Optimization

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130 CHAPTER 2. CONVEX GEOMETRYS = {s | s ≽ 0, 1 T s ≤ 1}1Figure 40: Unit simplex S in R 3 is a unique solid tetrahedron, but is notregular.will contain at least one line and there can be no vertex; id est, the conecannot otherwise be pointed.For any pointed polyhedral cone, there is a one-to-one correspondence ofone-dimensional faces with extreme directions.Examples of pointed closed convex cones K are not limited to polyhedralcones: the origin, any 0-based ray in a subspace, any two-dimensionalV-shaped cone in a subspace, the Lorentz (ice-cream) cone and its polyhedralflavors, the cone of Euclidean distance matrices EDM N in S N h , the propercones: S M + in ambient S M , any orthant in R n or R m×n ; e.g., the nonnegativereal line R + in vector space R .

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