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v2007.09.13 - Convex Optimization

v2007.09.13 - Convex Optimization

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104 CHAPTER 2. CONVEX GEOMETRY√2βsvec S 2 +(a)(b)α[ α ββ γ]Figure 33: (a) Projection of the PSD cone S 2 + , truncated above γ =1, onαβ-plane in isometrically isomorphic R 3 . View is from above with respect toFigure 31. (b) Truncated above γ =2. From these plots we may infer, forexample, the line { [ 0 1/ √ 2 γ ] T | γ ∈ R } intercepts the PSD cone at somelarge value of γ ; in fact, γ =∞ .

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