On the Spectrum of Nonself-Adjoint Dirac Operators withTwo-Point Boundary Conditions

We consider the spectral problem for the Dirac operator with arbitrary two-point boundary conditions and any square integrable potential V. Necessary and sufficient conditions for an entire function to be the characteristic determinant of such an operator are established. In the case of irregular boundary conditions, conditions are found under which a set of complex numbers is the spectrum of the problem under consideration.