A generalization of the Schauder fixed point theorem via multivalued contractions
Cubiotti, Paolo ; Di Bella, Beatrice
Commentationes Mathematicae Universitatis Carolinae, Tome 42 (2001), p. 637-640 / Harvested from Czech Digital Mathematics Library

We establish a fixed point theorem for a continuous function $f:X\to E$, where $E$ is a Banach space and $X\subseteq E$. Our result, which involves multivalued contractions, contains the classical Schauder fixed point theorem as a special case. An application is presented.

Publié le : 2001-01-01
Classification:  47H04,  47H10
@article{119279,
     author = {Paolo Cubiotti and Beatrice Di Bella},
     title = {A generalization of the Schauder fixed point theorem via multivalued contractions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     volume = {42},
     year = {2001},
     pages = {637-640},
     zbl = {1068.47070},
     mrnumber = {1883372},
     language = {en},
     url = {http://dml.mathdoc.fr/item/119279}
}
Cubiotti, Paolo; Di Bella, Beatrice. A generalization of the Schauder fixed point theorem via multivalued contractions. Commentationes Mathematicae Universitatis Carolinae, Tome 42 (2001) pp. 637-640. http://gdmltest.u-ga.fr/item/119279/

Aubin J.P.; Frankowska H. Set-Valued Analysis, Birkhäuser, Boston, 1990. | MR 1048347 | Zbl 1168.49014

Dugundji J.; Granas A. Fixed Point Theory, Vol. I, PWN - Polish Scientific Publishers, Warsaw, 1982. | MR 0660439 | Zbl 1025.47002

Hoffmann A. The distance to the intersection of two convex sets expressed by the distances to each of them, Math. Nachr. 157 (1992), 81-98. (1992) | MR 1233049 | Zbl 0773.52002

Klein E.; Thompson A.C. Theory of Correspondences, John Wiley and Sons, New York, 1984. | MR 0752692 | Zbl 0556.28012

Ricceri B. Une propriété topologique de l'ensemble des points fixes d'une contraction multivoque à valeurs convexes, Atti Acc. Lincei Rend. Fis. 81 (8) (1987), 283-286. (1987) | MR 0999821 | Zbl 0666.47030