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v2009.01.01 - Convex Optimization

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150 CHAPTER 2. CONVEX GEOMETRY<br />

K ∗<br />

K<br />

0<br />

R 3 R 2<br />

K ∗<br />

K<br />

0<br />

Figure 52: When convex cone K is any one Cartesian axis, its dual cone<br />

is the convex hull of all axes remaining. In R 3 , dual cone K ∗ (drawn tiled<br />

and truncated) is a hyperplane through origin; its normal belongs to line K .<br />

In R 2 , dual cone K ∗ is a line through origin while convex cone K is that line<br />

orthogonal.

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