On left-definite sturm-liouville equations

Sturm-Liouville equations are very important to understand the nature of the real-world problems and have been investigated by many authors. To investigate the spectral properties of these problems it is convenient to construct the Hilbert space. Such a construction is done with the help of the weight function. In 1992, A.M. Krall studied on the second order equation -(pg′)′ + qg =λwg, where p, q, w are real-valued functions with 1/p, q, w > 0 on the given interval [c,d] subject to some boundary conditions in the Sobolev space. Such equations are called left-definite equations. He also investigated the left definite fourth order equations and Hamiltonian systems on the finite intervals. Moreover, Race and Krall studied on the Weyl theory for a left-definite second order equation. Using these obtained results second-order, fourth-order equations and Hamiltonian systems are studied on finite and infinite intervals in this thesis.