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- Bashir Ahmad, Juan J. Nieto
- Computers & Mathematics with Applications
- 2009

This paper studies a coupled system of nonlinear fractional differential equation with three-point boundary conditions. Applying the Schauder fixed point theorem, an existence result is proved for the following system D α u (t) = f (t, v (t) , D m v (t)) , t ∈ (0, 1) , D β v (t) = g (t, u (t) , D n u (t)) , t ∈ (0, 1) , u (0) = 0, D θ u (1) = δD θ u (η) , v… (More)

- Bashir Ahmad, Juan J. Nieto
- Computers & Mathematics with Applications
- 2011

- Paul W. Eloe, Bashir Ahmad
- Appl. Math. Lett.
- 2005

We discuss the existence of positive solutions of a nonlinear nth order boundary value problem u (n) + a(t) f (u) = 0, t ∈ (0, 1) u(0) = 0, u (n−2) (0) = 0, αu(η) = u(1), where 0 < η < 1, 0 < αη n−1 < 1. In particular, we establish the existence of at least one positive solution if f is either superlinear or sublinear by applying the fixed point theorem in… (More)

- Bashir Ahmad
- Appl. Math. Lett.
- 2010

- Bashir Ahmad, Ahmed Alsaedi, Franco Brezzi, L. Donatella Marini, Alessandro Russo
- Computers & Mathematics with Applications
- 2013

In the original Virtual Element space with degree of accuracy k, projector operators in the H 1-seminorm onto polynomials of degree ≤ k can be easily computed. On the other hand, projections in the L 2 norm are available only on polynomials of degree ≤ k − 2 (directly from the degrees of freedom). Here we present a variant of VEM that allows the exact… (More)

In this paper, we study the existence of solutions for a boundary value problem of differential inclusions of order q ∈ (1, 2] with non-separated boundary conditions involving convex and non-convex multivalued maps. Our results are based on the nonlinear alternative of Leray Schauder type and some suitable theorems of fixed point theory.

This paper studies a boundary value problem of nonlinear second-order q-difference equations with non-separated boundary conditions. As a first step, the given boundary value problem is converted to an equivalent integral operator equation by using the q-difference calculus. Then the existence and uniqueness of solutions of the problem is proved via the… (More)

We study an initial value problem for a coupled Caputo type nonlinear fractional differential system of higher order. As a first problem, the nonhomogeneous terms in the coupled fractional differential system depend on the fractional derivatives of lower orders only. Then the nonhomogeneous terms in the fractional differential system are allowed to depend… (More)

This article presents necessary conditions for the existence of weak solutions of the following space-nonlocal evolution equations on H × (0, +∞), where H is the Heisenberg group:

- Bashir Ahmad, S. Sivasundaram
- Applied Mathematics and Computation
- 2010