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v2007.09.13 - Convex Optimization

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v2007.09.13 - Convex Optimization

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A.4. SCHUR COMPLEMENT 501When A is invertible,detG = detA det(C − B T A −1 B) (1326)When C is invertible,detG = detC det(A − BC −1 B T ) (1327)When B is full-rank and skinny, C = 0, and A ≽ 0, then [46,10.1.1]detG ≠ 0 ⇔ A + BB T ≻ 0 (1328)When B is a (column) vector, then for all C ∈ R and all A of dimensioncompatible with Gwhile for C ≠ 0detG = det(A)C − B T A T cofB (1329)detG = C det(A − 1 C BBT ) (1330)where A cof is the matrix of cofactors [247,4] corresponding to A .When B is full-rank and fat, A = 0, and C ≽ 0, thendetG ≠ 0 ⇔ C + B T B ≻ 0 (1331)When B is a row vector, then for A ≠ 0 and all C of dimensioncompatible with GdetG = A det(C − 1 A BT B) (1332)while for all A∈ RdetG = det(C)A − BCcofB T T (1333)where C cof is the matrix of cofactors corresponding to C .

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