Displaying 261 – 280 of 319

Showing per page

On the Rockafellar theorem for Φ γ ( · , · ) -monotone multifunctions

S. Rolewicz (2006)

Studia Mathematica

Let X be an arbitrary set, and γ: X × X → ℝ any function. Let Φ be a family of real-valued functions defined on X. Let Γ : X 2 Φ be a cyclic Φ γ ( · , · ) -monotone multifunction with non-empty values. It is shown that the following generalization of the Rockafellar theorem holds. There is a function f: X → ℝ such that Γ is contained in the Φ γ ( · , · ) -subdifferential of f, Γ ( x ) Φ γ ( · , · ) f | x .

On the Schauder fixed point theorem

Lech Górniewicz, Danuta Rozpłoch-Nowakowska (1996)

Banach Center Publications

The paper contains a survey of various results concerning the Schauder Fixed Point Theorem for metric spaces both in single-valued and multi-valued cases. A number of open problems is formulated.

On the semilinear integro-differential nonlocal Cauchy problem

Piotr Majcher, Magdalena Roszak (2005)

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

In this paper, we prove an existence theorem for the pseudo-non-local Cauchy problem x ' ( t ) + A x ( t ) = f ( t , x ( t ) , t t k ( t , s , x ( s ) ) d s ) , x₀(t₀) = x₀ - g(x), where A is the infinitesimal generator of a C₀ semigroup of operator T ( t ) t > 0 on a Banach space. The functions f,g are weakly-weakly sequentially continuous and the integral is taken in the sense of Pettis.

On the solutions of the inhomogeneous evolution equation in Banach spaces

Eugenio Sinestrari (1981)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

Vengono dati nuovi teoremi di regolarità per le soluzioni dell'equazione u ( t ) = Λ u ( t ) + f ( t ) nel caso in cui Λ è il generatore infinitesimale di un semigruppo analitico in uno spazio di Banach E e f è una funzione continua.

On the stability analysis of Darboux problem on both bounded and unbounded domains

Canan Çelik, Faruk Develi (2024)

Applications of Mathematics

In this paper, we first investigate the existence and uniqueness of solution for the Darboux problem with modified argument on both bounded and unbounded domains. Then, we derive different types of the Ulam stability for the proposed problem on these domains. Finally, we present some illustrative examples to support our results.

On the Stability of Jungck–Mann, Jungck–Krasnoselskij and Jungck Iteration Processes in Arbitrary Banach Spaces

Alfred Olufemi Bosede (2011)

Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica

In this paper, we establish some stability results for the Jungck–Mann, Jungck–Krasnoselskij and Jungck iteration processes in arbitrary Banach spaces. These results are proved for a pair of nonselfmappings using the Jungck–Mann, Jungck–Krasnoselskij and Jungck iterations. Our results are generalizations and extensions to a multitude of stability results in literature including those of Imoru and Olatinwo [8], Jungck [10], Berinde [1] and many others.

Currently displaying 261 – 280 of 319