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v2007.09.13 - Convex Optimization

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685> greater thanpositive for α∈ R , α > 0⌊ ⌋ floor function, ⌊x⌋ is greatest integer not exceeding x| | entrywise absolute value of scalars, vectors, and matricesdetmatrix determinant‖x‖ vector 2-norm or Euclidean norm ‖x‖ 2√n∑‖x‖ l= l |x j | l vector l-normj=1‖x‖ ∞ = max{|x j | ∀j} infinity-norm‖x‖ 2 2 = x T x = 〈x , x〉‖x‖ 1 = 1 T |x| 1-norm, dual infinity-norm‖x‖ 0 0-norm, cardinality of vector x , cardx ≡ ‖x‖ 0 , 0 0 = ∆ 0‖X‖ 2= sup ‖Xa‖ 2 = σ 1 = √ λ(X T X) 1‖a‖=1largest singular value,matrix 2-norm (spectral norm),‖δ(x)‖ 2 = ‖x‖ ∞‖X‖ = ‖X‖ F Frobenius’ matrix norm

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