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v2009.01.01 - Convex Optimization

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A.1. MAIN-DIAGONAL δ OPERATOR, λ , TRACE, VEC 539<br />

16. tr(ΛA) = δ(Λ) T δ(A), δ 2 (Λ) ∆ = Λ ∈ S N<br />

17. y T Bδ(A) = tr ( Bδ(A)y T) = tr ( δ(B T y)A ) = tr ( Aδ(B T y) )<br />

= δ(A) T B T y = tr ( yδ(A) T B T) = tr ( A T δ(B T y) ) = tr ( δ(B T y)A T)<br />

18. δ 2 (A T A) = ∑ i<br />

e i e T iA T Ae i e T i<br />

19. δ ( δ(A)1 T) = δ ( 1δ(A) T) = δ(A)<br />

20. δ(A1)1 = δ(A11 T ) = A1 , δ(y)1 = δ(y1 T ) = y<br />

21. δ(I1) = δ(1) = I<br />

22. δ(e i e T j 1) = δ(e i ) = e i e T i<br />

23. For ζ =[ζ i ]∈ R k and x=[x i ]∈ R k ,<br />

∑<br />

ζ i /x i = ζ T δ(x) −1 1<br />

i<br />

24.<br />

vec(A ◦ B) = vec(A) ◦ vec(B) = δ(vecA) vec(B)<br />

= vec(B) ◦ vec(A) = δ(vecB) vec(A)<br />

(35)(1664)<br />

25. vec(AXB) = (B T ⊗ A) vec X<br />

(<br />

not<br />

H )<br />

26. vec(BXA) = (A T ⊗ B) vec X<br />

27.<br />

tr(AXBX T ) = vec(X) T vec(AXB) = vec(X) T (B T ⊗ A) vec X [140]<br />

= δ ( vec(X) vec(X) T (B T ⊗ A) ) T<br />

1<br />

28.<br />

tr(AX T BX) = vec(X) T vec(BXA) = vec(X) T (A T ⊗ B) vec X<br />

= δ ( vec(X) vec(X) T (A T ⊗ B) ) T<br />

1

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