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v2007.09.17 - Convex Optimization

v2007.09.17 - Convex Optimization

v2007.09.17 - Convex Optimization

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A.3. PROPER STATEMENTS 491By similar reasoning,λ(I + µA) = 1 + λ(µA) (1256)For vector σ(A) holding the singular values of any matrix Aσ(I + µA T A) = π(|1 + µσ(A T A)|) (1257)σ(µI + A T A) = π(|µ1 + σ(A T A)|) (1258)where π is the nonlinear permutation operator sorting its vectorargument into nonincreasing order.For A∈ S M and each and every ‖w‖= 1 [150,7.7, prob.9]w T Aw ≤ µ ⇔ A ≼ µI ⇔ λ(A) ≼ µ1 (1259)[150,2.5.4] (confer (36))A is normal ⇔ ‖A‖ 2 F = λ(A) T λ(A) (1260)For A∈ R m×n A T A ≽ 0, AA T ≽ 0 (1261)because, for dimensionally compatible vector x , x T A T Ax = ‖Ax‖ 2 2 ,x T AA T x = ‖A T x‖ 2 2 .For A∈ R n×n and c∈Rtr(cA) = c tr(A) = c1 T λ(A)(A.1.1 no.6)For m a nonnegative integer, (1637)det(A m ) =tr(A m ) =n∏λ(A) m i (1262)i=1n∑λ(A) m i (1263)i=1

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