Über die Existenz von Wellenoperatoren für zeitabhängige Störungen.
Über die Untermengen der Lösungen der Gleichung
Ueber asymptotische Darstellungen von Functionen.
Uniform Fourth Order Difference Scheme for a Singular Perturbation Problem.
Uniform methods for semilinear problems with an attractive boundary turning point.
Uniform second-order difference method for a singularly perturbed three-point boundary value problem.
Uniform treatment of canonical perturbation theories.
Uniformly convergent difference scheme for singularly perturbed problem of mixed type.
Uniformly convergent schemes for singularly perturbed differential equations based on collocation methods.
Uniformly enclosing discretization methods for semilinear boundary value problems
Upper and lower solutions for singularly perturbed semilinear Neumann's problem
The paper establishes sufficient conditions for the existence of solutions of Neumann’s problem for the differential equation which tend to the solution of the reduced problem on as