Ueber die Function W (...) für singuläre Werthe ihrer Parameter.
Unbounded Jacobi Matrices with Empty Absolutely Continuous Spectrum
Sufficient conditions for the absence of absolutely continuous spectrum for unbounded Jacobi operators are given. A class of unbounded Jacobi operators with purely singular continuous spectrum is constructed as well.
Uniform asymptotic stability and robust stability for positive linear Volterra difference equations in Banach lattices.
Uniqueness and multiplicity of solutions for a second-order discrete boundary value problem with a parameter.
Uniqueness implies existence for discrete fourth order Lidstone boundary-value problems.
Upper and lower solutions method for discrete inclusions with nonlinear boundary conditions.
Using supermodels in quantum optics.