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v2009.01.01 - Convex Optimization

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102 CHAPTER 2. CONVEX GEOMETRY<br />

B<br />

C<br />

A<br />

D<br />

Figure 36: Properties of extreme points carry over to extreme directions.<br />

[266,18] Four rays (drawn truncated) on boundary of conic hull of<br />

two-dimensional closed convex set from Figure 27 lifted to R 3 . Ray<br />

through point A is exposed hence extreme. Extreme direction B on cone<br />

boundary is not an exposed direction, although it belongs to the exposed<br />

face cone{A,B}. Extreme ray through C is exposed. Point D is neither<br />

an exposed or extreme direction although it belongs to a two-dimensional<br />

exposed face of the conic hull.<br />

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