Donal O’Regan

Existence of solutions for semi-linear abstract differential equations with not instantaneous impulses

Michelle Pierri, Donal O’Regan, Vanessa Rolnik · Applied Mathematics and Computation · 2013 · 200 citations · Full text

Instantaneous Impulses, Nonlinear Hyperbolic Problem, Impulsive System +1

Singular boundary value problems for first and second order impulsive differential equations

Ravi P. Agarwal, Daniel Franco, Donal O’Regan · Aequationes Mathematicae · 2005 · 80 citations

Numerical Analysis, Impulsive System, Singularly Perturbed Problem +1

Solvability of some nonlinear boundary value problems

L. E. Bobisud, Donal O’Regan, W. D. Royalty · Nonlinear Analysis · 1988 · 72 citations

Elliptic Equation, Nonlinear Equation, Nonlinear Functional Analysis

Strong convergence theorems for relatively nonexpansive mappings in Banach spaces with applications

Xi Li, Nan‐jing Huang, Donal O’Regan · Computers & Mathematics with Applications · 2010 · 43 citations

Banach Spaces, Nonexpansive Mappings, Strong Convergence Theorems +2

Existence theory for nonlinear Fredholm and Volterra integral equations on half-open intervals

Maria Meehan, Donal O’Regan · Nonlinear Analysis · 1999 · 37 citations

Elliptic Equation, Resolvent Kernel, Half-open Intervals +5