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v2007.09.13 - Convex Optimization

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96 CHAPTER 2. CONVEX GEOMETRYBCADFigure 30: Properties of extreme points carry over to extreme directions.[228,18] Four rays (drawn truncated) on boundary of conic hull oftwo-dimensional closed convex set from Figure 21 lifted to R 3 . Raythrough point A is exposed hence extreme. Extreme direction B on coneboundary is not an exposed direction, although it belongs to the exposedface cone{A,B}. Extreme ray through C is exposed. Point D is neitheran exposed or extreme direction although it belongs to a two-dimensionalexposed face of the conic hull.0

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