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Fixed points of set-valued maps with closed proximally ∞-connected values

Grzegorz Gabor — 1995

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Introduction Many authors have developed the topological degree theory and the fixed point theory for set-valued maps using homological techniques (see for example [19, 28, 27, 16]). Lately, an elementary technique of single-valued approximation (on the graph) (see [11, 1, 13, 5, 9, 2, 6, 7]) has been used in constructing the fixed point index for set-valued maps with compact values (see [21, 20, 4]). In [20, 4] authors consider set-valued upper semicontinuous...

On existence of equilibria of set-valued maps

Grzegorz Gabor;  Marc Quincampoix — 2003

Bollettino dell'Unione Matematica Italiana

The present paper is devoted to sufficient conditions for existence of equilibria of Lipschitz multivalued maps in prescribed subsets of finite-dimensional spaces. The main improvement of the present study lies in the fact that we do not suppose any regular assumptions on the boundary of the subset. Our approach is based on behaviour of trajectories to the corresponding differential inclusion.

Equilibria and strict equilibria of multivalued maps on noninvariant sets

Pierre Cardaliaguet;  Grzegorz Gabor;  Marc Quincampoix — 2003

Annales Polonici Mathematici

This paper is concerned with existence of equilibrium of a set-valued map in a given compact subset of a finite-dimensional space. Previously known conditions ensuring existence of equilibrium imply that the set is either invariant or viable for the differential inclusion generated by the set-valued map. We obtain some equilibrium existence results with conditions which imply neither invariance nor viability of the given set. The problem of existence of strict equilibria is also discussed.

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