The Principal Eigenvalue and The Principal Eigenfunction of A Boundary-Value-Transmission Problem

Authors : Kadriye AYDEMİR, Hayati OLĞAR, Oktay MUKHTAROV

Pages : 97-100

View : 24 | Download : 10

Publication Date : 2019-12-31

Article Type : Research Paper

Abstract : It is well-know that the Sturm-Liouville theory justifies the `separation of variables`n method  for voluminous partial differential equation problems. For Sturm-Liouville problems the Rayleigh quotient is  the basis of an important approximation method that is used in physics, as well as in engineering. Although any eigenvalue can be related to its eigenfunction by the Rayleigh quotient, this quotient cannot be used to determine the exact value of the eigenvalue since eigenfunction is unknown. However, interesting and significant results can be obtained from the Rayleigh quotient without solving the differential equationinsert ignore into journalissuearticles values(i.e.  even in the case when the eigenfunction is not known);. For example, Rayleigh quotient can be quite useful in estimating the eigenvalue.   It is the purpose of this paper to extend and generalize such  important spectral properties as  eigenfunction expansion and Parseval equality for Sturm-Liouville problems with interior singularities. We shall investigate certain spectral problems  arising in the theory of the convergence of the eigenfunction expansion. Particularly, by modifying the Green`s function method we shall extend and generalize such important spectral properties as  Parseval`s equality, Rayleigh quotient and Rayleigh-Ritz  formula for the considered problem.
Keywords : Boundary value problem, Rayleigh quotient