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v2007.09.17 - Convex Optimization

v2007.09.17 - Convex Optimization

v2007.09.17 - Convex Optimization

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2.13. DUAL CONE & GENERALIZED INEQUALITY 155(a)K0 ∂K ∗∂K ∗K(b)Figure 48: Two (truncated) views of a polyhedral cone K and its dual in R 3 .Each of four extreme directions from K belongs to a face of dual cone K ∗ .Shrouded (inside) cone K is symmetrical about its axis of revolution. Eachpair of diametrically opposed extreme directions from K makes a right angle.An orthant (or any rotation thereof; a simplicial cone) is not the only self-dualpolyhedral cone in three or more dimensions; [17,2.A.21] e.g., consider anequilateral with five extreme directions. In fact, every self-dual polyhedralcone in R 3 has an odd number of extreme directions. [19, thm.3]

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