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v2007.09.13 - Convex Optimization

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676 APPENDIX G. NOTATION AND A FEW DEFINITIONSx + vector x whose negative entries are replaced with 0 ,or clipped vector x or nonnegative part of xx ⋆x ∗f ∗P C x or PxP k xδ(A)δ 2 (A)δ(A) 2λ i (X)λ(X) iλ(A)σ(A)Σ∑π(γ)ΞΠ∏optimal value of variable xcomplex conjugate or dual variableconvex conjugate functionprojection of point x on set C , P is operator or idempotent matrixprojection of point x on set C k or on range of implicit vector(A.1) vector made from the main diagonal of A if A is a matrix;otherwise, diagonal matrix made from vector A≡ δ(δ(A)). For vector or diagonal matrix Λ , δ 2 (Λ) = Λ= δ(A)δ(A) where A is a vectori th entry of vector λ is function of Xi th entry of vector-valued function of Xvector of eigenvalues of matrix A , (1261) typically arranged innonincreasing ordervector of singular values of matrix A (always arranged in nonincreasingorder), or support functiondiagonal matrix of singular values, not necessarily squaresumnonlinear permutation operator (or presorting function) arrangesvector γ into nonincreasing order (7.1.3)permutation matrixdoublet or permutation matrixproduct

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