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v2009.01.01 - Convex Optimization

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88 CHAPTER 2. CONVEX GEOMETRY<br />

X<br />

(a)<br />

0<br />

0<br />

(b)<br />

X<br />

Figure 28: (a) Two-dimensional nonconvex cone drawn truncated. Boundary<br />

of this cone is itself a cone. Each polar half is itself a convex cone. (b) This<br />

convex cone (drawn truncated) is a line through the origin in any dimension.<br />

It has no relative boundary, while its relative interior comprises entire line.<br />

0<br />

Figure 29: This nonconvex cone in R 2 is a pair of lines through the origin.<br />

[215,2.4]

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