Über die Fixpunktmengen einer Klasse Volterrascher Integraloperatoren in Banachräumen.
Über die Lösungen Urysohnscher Integralgleichungen.
Über die Stabilität von Lösungen nichtlinearer Operatorengleichungen in nicht notwendig lokalkonvexen topologischen Vektorräumen
Über die verallgemeinerten Fixpunktindizes von Iterierten verdichtender Abbildungen.
Über Fixpunkte kompakter Abbilidungen in topologischen Vektorräumen
Un procédé itératif avec l'opérateur modifie et les problèmes d'approximation
Una generalizzazione di certe algebre che intervengono nella teoria dei sistemi
Une propriété topologique de l'ensemble des points fixes d'une contraction multivoque à valeurs convexes
In this Note we first establish a result on the structure of the set of fixed points of a multi-valued contraction with convex values. As a consequence of this result, we then obtain the following theorem: Let , be two real Banach spaces and let be a continuous linear operator from onto . Put: . Then, for every and every lipschitzian operator , with Lipschitz constant such that , the set is non-empty and arc wise connected.
Uniform asymptotic normal structure, the uniform semi-Opial property and fixed points of asymptotically regular uniformly Lipschitzian semigroups. I.
Uniform asymptotic normal structure, the uniform semi-opial property, and fixed points of asymptotically regular uniformly Lipschitzian semigroups. II.
Uniformly normal structure and fixed points of uniformly Lipschitzian mappings
Unitary dilation and fixed point theorem
Upper and lower solutions method for partial Hadamard fractional integral equations and inclusions
In this paper we use the upper and lower solutions method combined with Schauder's fixed point theorem and a fixed point theorem for condensing multivalued maps due to Martelli to investigate the existence of solutions for some classes of partial Hadamard fractional integral equations and inclusions.
Using implicit relations to prove unified fixed point theorems in metric and 2-metric spaces.