17 Result(s)

Article

A Study of a More General Class of Nonlocal Integro-Multipoint Boundary-Value Problems for Fractional Integrodifferential Inclusions

We develop the existence theory for a more general class of nonlocal integro-multipoint boundary-value problems for Caputo-type fractional integrodifferential inclusions. Our results include the convex and non...

B. Ahmad, S. K. Ntouyas, A. Alsaedi in Ukrainian Mathematical Journal (2021)

Article

A Coupled System of Nonlocal Fractional Differential Equations with Coupled and Uncoupled Slit-Strips-Type Integral Boundary Conditions

The paper deals with with the existence and uniqueness of solutions for a coupled system of fractional differential equations with coupled and uncoupled slit-strips-type integral boundary conditions. The exist...

B. Ahmad, S. K. Ntouyas in Journal of Mathematical Sciences (2017)

Article

Controllability for Semilinear Neutral Functional Differential Inclusions via Analytic Semigroups

In this paper, we prove controllability results for semilinear neutral functional differential inclusions with finite or infinite delay in Banach spaces. Our theory makes use of analytic semigroups and fracti...

S. K. Ntouyas, D. O’Regan in Journal of Optimization Theory and Applications (2007)

Article

Existence Results for Semilinear Neutral Functional Differential Inclusions via Analytic Semigroups

In this paper we prove existence results for semilinear neutral functional differential inclusions with finite or infinite delay in Banach spaces. Our theory makes use of analytic semigroups and fractional po...

S. K. Ntouyas, D. O’Regan in Acta Applicandae Mathematicae (2007)

Article

Controllability Results for Semilinear Evolution Inclusions with Nonlocal Conditions

In this paper, we prove controllabillity results for mild solutions defined on a compact real interval for first-order semilinear differential and integrodifferential evolution inclusions in Banach spaces with...

M. Benchohra, E.P. Gatsori, S.K. Ntouyas in Journal of Optimization Theory and Applications (2003)

Article

Controllability for Functional Differential and Integrodifferential Inclusions in Banach Spaces

In this paper, we establish sufficient conditions for the controllability of functional differential and integrodifferential inclusions in Banach spaces. We rely on a fixed-point theorem for condensing maps du...

M. Benchohra, S.K. Ntouyas in Journal of Optimization Theory and Applications (2002)

Article

Controllability of Nonlinear Differential Equations in Banach Space with Nonlocal Conditions

In this paper, we establish sufficient conditions for the controllability of semilinear evolution systems in Banach space with nonlocal conditions. We rely on a fixed-point theorem for compact maps due to Scha...

M. Benchohra, S. K. Ntouyas in Journal of Optimization Theory and Applications (2001)

Article

Controllability for an Infinite-Time Horizon of Second-Order Differential Inclusions in Banach Spaces with Nonlocal Conditions

In this paper, we establish sufficient conditions for the controllability on semi-infinite intervals of second-order differential inclusions in Banach spaces with nonlocal conditions. We rely on a fixed-point ...

M. Benchohra, S. K. Ntouyas in Journal of Optimization Theory and Applications (2001)

Article

Controllability of Second-Order Differential Inclusions in Banach Spaces with Nonlocal Conditions

In this paper, we establish sufficient conditions for the controllability ofsecond-order differential inclusions in Banach spaces with nonlocalconditions. We rely on a fixed-point theorem for condensing maps d...

M. Benchohra, S. K. Ntouyas in Journal of Optimization Theory and Applications (2000)

Article

An Existence Result for Second Order Functional Differential Inclusions

In this paper we investigate the existence of mild solutions on a compact interval for second order functional differential inclusions in Banach spaces. We shall rely on a fixed point theorem for condensing ma...

M. Benchohra, S. K. Ntouyas in Results in Mathematics (2000)

Article

Global Existence for Functional Semilinear Volterra Integrodifferential Equations in Banach Spaces

In this paper, we study the global existence of solutions for initial value problems for functional semilinear Volterra integrodifferential equations in a Banach space, by using the Leray-Schauder Alternative.

S. K. Ntouyas, P. Ch. Tsamatos in Acta Mathematica Hungarica (1998)

Article

Boundary value problems for differential equations with deviating arguments

P. Ch. Tsamatos, S. K. Ntouyas in Czechoslovak Mathematical Journal (1997)

Article

Global existence for second order functional semilinear equations

In this paper we study the global existence of solutions for initial value problems for functional semilinear equations, where the linear operator in the differential equation is the infinitesimal generator of...

S. K. Ntouyas, P. Ch. Tsamatos in Periodica Mathematica Hungarica (1995)

Article

On a Bellman-Bihari type integral inequality with delay

P. Ch. Tsamatos, S. K. Ntouyas in Periodica Mathematica Hungarica (1991)

Article

On a boundary value problem for functional differential equations

S. K. Ntouyas in Acta Mathematica Hungarica (1986)

Article

On the asymptotic behavior of neutral functional differential equations

S. K. Ntouyas, Y. G. Sficas in Archiv der Mathematik (1983)