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v2009.01.01 - Convex Optimization

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720 APPENDIX F. NOTATION AND A FEW DEFINITIONS<br />

‖x‖ ∞ = max{|x j | ∀j} infinity-norm<br />

‖x‖ 2 2 = x T x = 〈x , x〉<br />

‖x‖ 1 = 1 T |x| 1-norm, dual infinity-norm<br />

‖x‖ 0 0-norm (4.5.1), cardinality of vector x , card x ≡ ‖x‖ 0 , 0 0 = ∆ 0<br />

‖X‖ 2<br />

= sup ‖Xa‖ 2 = σ 1 = √ λ(X T X) 1<br />

‖a‖=1<br />

matrix 2-norm (spectral norm),<br />

largest singular value, ‖Xa‖ 2 ≤ ‖X‖ 2 ‖a‖ 2 [134, p.56], ‖δ(x)‖ 2 = ‖x‖ ∞<br />

‖X‖ = ‖X‖ F Frobenius’ matrix norm

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