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v2006.03.09 - Convex Optimization

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90 CHAPTER 2. CONVEX GEOMETRYABCDFigure 20: Closed convex set in R 2 . Point A is exposed hence extreme. PointB is extreme but not an exposed point. Point C is exposed and extreme.Point D is neither an exposed or extreme point although it belongs to aone-dimensional exposed face. [123,A.2.4] [210,3.6] Closed face AB isexposed; a facet. The arc is not a conventional face, yet it is composedentirely of extreme points. The union of rotations of this entire set about itsvertical edge produces another set in three dimensions having no edges; thesame is false for rotation about the horizontal edge.

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