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A stability result for differential inclusions in Banach spaces. (English) Zbl 0594.34016
In this paper one existence theorem for the differential inclusion (1) $\dot x\in F(t,x)$, $x(t\sb 0)=x\sb 0$ in a separable Banach space is proved. The multifunction F has nonempty, compact, convex values and satisfies the Caratheodory-type conditions. The proof uses the Ky Fan fixed point theorem and some properties of integral of multifunctions. Next the continuous dependence of solutions to (1) on the right-hand side is studied where the convergence of $F\sb n$ to F is unerstand in Kuratowski-Mosco sense. At the end one theorem on convergence of the sets of fixed points of some sequence of multifunctions, say $\{F\sb n\}$, (with Lipschitz constants smaller than 1) to the set of fixed points of the limit of $F\sb n$ in a Banach space with Frechet-differentiable norm is proved. A theorem of the same type is proved for the set of integrable selectors of a sequence of multifunctions.
Reviewer: Z.Wyderka

34A60Differential inclusions
28B20Set-valued set functions and measures; integration of set-valued functions; measurable selections
54C65Continuous selections
49R50Variational methods for eigenvalues of operators (MSC2000)
Full Text: DOI
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