10.03.2015 Views

v2009.01.01 - Convex Optimization

v2009.01.01 - Convex Optimization

v2009.01.01 - Convex Optimization

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

162 CHAPTER 2. CONVEX GEOMETRY<br />

(a)<br />

K<br />

0 ∂K ∗<br />

∂K ∗<br />

K<br />

(b)<br />

Figure 54: Two (truncated) views of a polyhedral cone K and its dual in R 3 .<br />

Each of four extreme directions from K belongs to a face of dual cone K ∗ .<br />

Cone K , shrouded by its dual, is symmetrical about its axis of revolution.<br />

Each pair of diametrically opposed extreme directions from K makes a right<br />

angle. An orthant (or any rotation thereof; a simplicial cone) is not the<br />

only self-dual polyhedral cone in three or more dimensions; [19,2.A.21] e.g.,<br />

consider an equilateral having five extreme directions. In fact, every self-dual<br />

polyhedral cone in R 3 has an odd number of extreme directions. [21, thm.3]

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!