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v2009.01.01 - Convex Optimization

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2.3. HULLS 65<br />

Figure 20: A simplicial cone (2.12.3.1.1) in R 3 whose boundary is drawn<br />

truncated; constructed using A∈ R 3×3 and C = 0 in (259). By the most<br />

fundamental definition of a cone (2.7.1), entire boundary can be constructed<br />

from an aggregate of rays emanating exclusively from the origin. Each<br />

of three extreme directions corresponds to an edge (2.6.0.0.3); they are<br />

conically, affinely, and linearly independent for this cone. Because this<br />

set is polyhedral, exposed directions are in one-to-one correspondence with<br />

extreme directions; there are only three. Its extreme directions give rise to<br />

what is called a vertex-description of this polyhedral cone; simply, the conic<br />

hull of extreme directions. Obviously this cone can also be constructed by<br />

intersection of three halfspaces; hence the equivalent halfspace-description.

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