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v2007.09.13 - Convex Optimization

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78 CHAPTER 2. CONVEX GEOMETRYABCDFigure 21: Closed convex set in R 2 . Point A is exposed hence extreme;a classical vertex. Point B is extreme but not an exposed point. Point Cis exposed and extreme; zero-dimensional exposure makes it a vertex.Point D is neither an exposed or extreme point although it belongs to aone-dimensional exposed face. [147,A.2.4] [245,3.6] Closed face AB isexposed; a facet. The arc is not a conventional face, yet it is composedentirely of extreme points. Union of all rotations of this entire set aboutits vertical edge produces another convex set in three dimensions havingno edges; but that convex set produced by rotation about horizontal edgecontaining D has edges.

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