… on the parameter, including dependence of the boundary conditions, … and higher order
regular and singular ordinary differential operators with boundary conditions which do not depend …

… whose equivalent first order system can be … boundary eigenvalue problems for the differential
equation Kη = 2Hη, where K and H are differential operators such that K is of higher order …

… we recall that the g Regge problem is realised by a second order differential operator wh …
of ues for boundary conditions which lead to self- adjoint operator represent this paper we start …

… Higher order linear differential equations occur in applications with or without the eigenvalue
parameter in the boundary … fourth order periodic eigenvalue problem is self-adjoint using …

… differential operator L and its boundary conditions more precisely. Let H2m(0,π) denote the
usual Sobolev space of order … ], which deals with a particular second order version of (4.1). A …

… are associated with second order differential operators with suitable boundary conditions –
this … We will thoroughly discuss the eigenvalue multiplicities for these boundary conditions in …

… the spectrum of the self-adjoint Sturm-Liouville … differential equations or difference equations,
and give an effective way for numerical computation of eigenvalues of a differential operator…

… The eigenvalue … of self-adjoint eigenvalue problems, the eigenvalues of which are real
numbers, and propose a universal framework to give lower and upper bounds for eigenvalues. …

… consider 2nth order quasi-differential equations and derive necessary and sufficient
conditions for 2n boundary conditions of the form (1.2) to generate self-adjoint operators K and A. …

… operator and boundary-integral terms enter into the operator parts of the problems. For a
differential operator … Therefore the spectrum of H, consists of eigenvalues only, and the spectral …