Eigenvalues below the lower bound of minimal operators of singular Hamiltonian expressions ?
For singular Hamiltonian systems in the limit point case, this paper characterizes the number of eigenvalues of self-adjoint extensions below the lower bound of the minimal operator in terms of corresponding self-adjoint boundary conditions and the M(?) M ( ? ) matrix for the Friedrichs extension.
eigenvalue limit point case self-adjointness friedrichs extension hamiltonian operator