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v2007.09.13 - Convex Optimization

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A.1. MAIN-DIAGONAL δ OPERATOR, λ , TRACE, VEC 48115. y T Bδ(A) = tr ( Bδ(A)y T) = tr ( δ(B T y)A ) = tr ( Aδ(B T y) )= 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)16. δ 2 (A T A) = ∑ ie i e T iA T Ae i e T i17. δ ( δ(A)1 T) = δ ( 1δ(A) T) = δ(A)18. δ(A1)1 = δ(A11 T ) = A1 , δ(y)1 = δ(y1 T ) = y19. δ(I1) = δ(1) = I20. δ(e i e T j 1) = δ(e i ) = e i e T i21. vec(AXB) = (B T ⊗ A) vec X22. vec(BXA) = (A T ⊗ B) vec X23. tr(AXBX T ) = vec(X) T vec(AXB) = vec(X) T (B T ⊗A) vec X [115]24.tr(AX T BX) = vec(X) T vec(BXA) = vec(X) T (A T ⊗ B) vec X= δ ( vec(X) vec(X) T (A T ⊗ B) ) T125. For ζ =[ζ i ]∈ R k and x=[x i ]∈ R k ,∑ζ i /x i = ζ T δ(x) −1 126. For any permutation matrix Ξ and dimensionally compatible vector yor matrix Aiδ(Ξy) = Ξδ(y) Ξ T (1220)δ(ΞAΞ T ) = Ξδ(A) (1221)So given any permutation matrix Ξ and any dimensionally compatiblematrix B , for example,δ 2 (B) = Ξδ 2 (Ξ T B Ξ)Ξ T (1222)27. π(δ(A)) = λ(I ◦A) where π is the presorting function

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