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v2010.10.26 - Convex Optimization

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2.13. DUAL CONE & GENERALIZED INEQUALITY 171Given A∈ R n×m , we make vector substitution y ← A T yA T y ≽ 0 ⇔ x T A T y ≥ 0 for all x ≽ 0 (339)Introducing a new vector by calculating b Ax we getA T y ≽ 0 ⇔ b T y ≥ 0, b = Ax for all x ≽ 0 (340)By complementing sense of the scalar inequality:A T y ≽ 0or in the alternativeb T y < 0, ∃ b = Ax, x ≽ 0(341)If one system has a solution, then the other does not; define a convex coneK={y | A T y ≽0} , then y ∈ K or in the alternative y /∈ K .Scalar inequality b T y

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