Über das verallgemeinerte Randwertproblem der -ten Ordnung
Über die Existenz von Wellenoperatoren für zeitabhängige Störungen.
Über einige Randwertprobleme dritter Ordnung
Über Maximale Monotonie von Operatoren des Typs L*... L.
Un majorant du nombre des valeurs propres négatives correspondantes à l’opérateur de Schrödinger généralisé.
On donne une borne supérieur du nombre des valeurs propres négatives de l’opérateur de Schrödinger généralisé, cette borne est donnée en fonction d’un nombre fini de cube dyadiques minimaux.
Un risultato di molteplicità di soluzioni per problemi ai limiti semilineari
Unbounded solutions of BVP for second order ODE with -Laplacian on the half line
By applying the Leggett-Williams fixed point theorem in a suitably constructed cone, we obtain the existence of at least three unbounded positive solutions for a boundary value problem on the half line. Our result improves and complements some of the work in the literature.
Unbounded solutions of second-order multipoint boundary value problem on the half-line.
Unbounded upper and lower solution method for third-order boundary-value problems on the half-line.
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.
Uniformly convergent difference scheme for singularly perturbed problem of mixed type.
Uniformly enclosing discretization methods and grid generation for semilinear boundary value problems with first order terms
The paper deals with uniformly enclosing discretization methods of the first order for semilinear boundary value problems. Some fundamental properties of this discretization technique (the enclosing property, convergence, the inverse-monotonicity) are proved. A feedback grid generation principle using information from the lower and upper solutions is presented.
Uniformly enclosing discretization methods for semilinear boundary value problems
Unique solution of periodic boundary value problems.
Unique solvability for a second order nonlinear system via two global inversion theorems.
Unique solvability of a linear problem with perturbed periodic boundary values
We investigate the problem with perturbed periodic boundary values with for some arbitrary positive real number , by transforming the problem into an integral equation with the aid of a piecewise polynomial and utilizing the Fredholm alternative theorem to obtain a condition on the uniform norms of the coefficients , and which guarantees unique solvability of the problem. Besides having theoretical value, this problem has also important applications since decay is a phenomenon that all...
Uniqueness and multiplicity of solutions for a second-order discrete boundary value problem with a parameter.
Uniqueness and parameter dependence of positive solution of fourth-order nonhomogeneous BVPs.