Pseudo-Concave Programming and Lagrange Regularity

Abstract
For the mathematical programming problem max fx subject to Gx ≧ 0, we show that if Gx is pseudo-concave, a property weaker than concavity but stronger than quasi-concavity, and differentiable, then the constraint set is necessarily determined by the natural gradient tangent inequality system of G. We then apply the duality constructs of semi-infinite programming, in a manner which admits generalizations, to this special case to show that pseudo-concave constraint functions that have an interior point are convex Lagrange regular. Analogous to a theorem of Arrow-Hurwicz-Uzawa, we characterize functions that are both pseudo-concave and pseudo-convex, and for programming problems with objective functions of this form, we obtain equivalent problems having linear objective functions.

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