An eigenfunction expansion for a nonselfadjoint, interior point boundary value problem
An eigenfunction expansion for a nonselfadjoint, interior point boundary value problem
Under discussion is the vector system $Ly = yâ + Py,\sum \nolimits _{j = 0}^\infty {{A_j}y({t_j}) = 0}$, where $\sum \nolimits _{j = 0}^\infty {||A|| < \infty }$. The eigenvalues for the system are known to be countable and approach $\infty$ in the complex plane in a series of well-defined …