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v2007.09.17 - Convex Optimization

v2007.09.17 - Convex Optimization

v2007.09.17 - Convex Optimization

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60 CHAPTER 2. CONVEX GEOMETRYFigure 15: A simplicial cone (2.12.3.1.1) in R 3 whose boundary is drawntruncated; constructed using A∈ R 3×3 and C = 0 in (246). By the mostfundamental definition of a cone (2.7.1), entire boundary can be constructedfrom an aggregate of rays emanating exclusively from the origin. Eachof three extreme directions corresponds to an edge (2.6.0.0.3); they areconically, affinely, and linearly independent for this cone. Because thisset is polyhedral, exposed directions are in one-to-one correspondence withextreme directions; there are only three. Its extreme directions give rise towhat is called a vertex-description of this polyhedral cone; simply, the conichull of extreme directions. Obviously this cone can also be constructed byintersection of three halfspaces; hence the equivalent halfspace-description.

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