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v2007.09.13 - Convex Optimization

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2.13. DUAL CONE & GENERALIZED INEQUALITY 139f(x, z p ) or f(x)f(x p , z) or g(z)xzFigure 45: Although objective functions from conic problems (263p) and(263d) are linear, this is a mnemonic icon for primal and dual problems.When problems are strong duals, duality gap is 0 ; meaning, functionsf(x) and g(z) (dotted) kiss at saddle value, as depicted at center.Otherwise, dual functions never meet (f(x) > g(z)) by (261). Drawing byhttp://en.wikipedia.org/wiki/User:Kieff

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