On singular fifth-order boundary value problems with deficiency indices $\boldsymbol{(5,5)}$

E. Uğurlu, K. Taş

This paper is devoted to introduce a way of construction of the well-defined boundary conditions for the solutions of a singular fifth-order equation with deficiency indices $(5,5)$. Imposing suitable separated and coupled boundary conditions some properties of the eigenvalues of the problems have been investigated.