Implicit function theorems for generalized equations

Implicit function theorems for generalized equations

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Article ID: iaor19971101
Country: Netherlands
Volume: 70
Issue: 1
Start Page Number: 91
End Page Number: 106
Publication Date: Oct 1995
Journal: Mathematical Programming (Series A)
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Abstract:

The paper shows that Lipschitz and differentiability properties of a solution to a parameterized generalized equation 0∈f(x,y)+F(x), where f is a function and F is a set-valued map acting in Banach spaces, are determined by the corresponding Lipschitz and differentiability properties of a solution to z∈g(x)+F(x), where g strongly approximates f in the sense of Robinson. In particular, the inverse map (f+F)’-1 has a local selection which is Lipschitz continuous near x0 and Fréchet (Gateaux, Bouligand, directionally) differentiable at x0 if and only if the linearization inverse (f(x0)+∈f(x0)ë-x0)+F(ë))’-1 has the same properties. As an application, the paper studies directional differentiability of a solution to a variational inequality.

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