Correction of Finite Element Estimates for Sturm-Liouville Eigenvalues.
Correction of Numerov's Eigenvalue Estimates.
Cryptohermitian picture of scattering using quasilocal metric operators.
Das Verhalten der Greenschen Matrix und der Entwicklungen nach Eigenfunktionen N-regulärer Eigenwertprobleme.
Deficiency indices of a differential operator satisfying certain matching interface conditions.
Dense point spectrum and absolutely continuous spectrum in spherically symmetric Dirac operators.
Desingularization of a Hyperelliptic Curve Associated with a Doubly Periodic Dirac Potential
Diferenciální rovnice v ČSR v letech 1945-1985
Dirichlet-Neumann bracketing for boundary-value problems on graphs.
Discrete spectrum and principal functions of non-selfadjoint differential operator
In this article, we consider the operator defined by the differential expression in , where is a complex valued function. Discussing the spectrum, we prove that has a finite number of eigenvalues and spectral singularities, if the condition holds. Later we investigate the properties of the principal functions corresponding to the eigenvalues and the spectral singularities.
Discretization of Multiparameter Eigenvalue Problems
Effet Zeeman pour un électron de Dirac
Eigenfunction expansion for a regular fourth order eigenvalue problem with eigenvalue parameter in the boundary conditions.
Eigenstructure of nonselfadjoint complex discrete vector Sturm-Liouville problems.
Eigensystem of an L 2-perturbed harmonic oscillator is an unconditional basis
For any complex valued L p-function b(x), 2 ≤ p < ∞, or L ∞-function with the norm ‖b↾L ∞‖ < 1, the spectrum of a perturbed harmonic oscillator operator L = −d 2/dx 2 + x 2 + b(x) in L 2(ℝ1) is discrete and eventually simple. Its SEAF (system of eigen- and associated functions) is an unconditional basis in L 2(ℝ).
Eigenvalue approximation
Eigenvalue approximations for linear periodic differential equations with a singularity.
Eigenvalue characterization for a class of boundary value problems.
Eigenvalue comparisons for boundary value problems of the discrete beam equation.
Eigenvalue comparisons for differential equations on a measure chain.