An upper estimation for the eigenfrequencies of vibrating Liapunoff bodies (first boundary value problem).
Ancora sulle diseguaglianze di Wirtinger concernenti la derivata seconda
Approximation of eigenvalues of differential equations with non-smooth coefficients
Approximation von Eigenwertproblemen bei nichtlinearer Parameterabhängigkeit.
Asymptotic behaviour of the solutions of equations with impulse effect in a Banach space.
Asymptotics of the number of zeros and of the eigenvalues of general weighted Sturm-Liouville problems.
Asymptotique semi-classique pour la densité spectrale locale d'opérateurs de Schrödinger (d'après D. Robert et H. Tamura)
Boundary problems of the second order with an indefinite weight-function.
Boundary value problems with jumping nonlinearities
Branch Switching in Bifurcation Problems for Ordinary Differential Equations
C*-Algebras of Singular Integral operators on the line realted to singular Sturm-Liouville problems.
Chord Techniques and Newton's Method for Discrete Bifurcation Problems.
Coefficients de réflexion pour les potentiels de Hardy
Compactness of the inverse of the minimal operator for a class of ordinary differential expressions.
Connected branches of asymptotically equivalent solutions to non-linear eigenvalue problems
We prove an existence theorem for connected branches of solutions to nonlinear operator equations in Banach spaces. This abstract result is applied to the asymptotically equivalent solutions to nonlinear ordinary differential equations.
Continuous Branches of Positive Solutions for a Class of Nonlinear Second-Order Differential Equations.
Correction of Finite Element Estimates for Sturm-Liouville Eigenvalues.
Correction of Numerov's Eigenvalue Estimates.
Das Verhalten der Greenschen Matrix und der Entwicklungen nach Eigenfunktionen N-regulärer Eigenwertprobleme.
Deficiency indices of a differential operator satisfying certain matching interface conditions.