Normal correct narrowings for some differential operators

Investigated have been ordinary differential operators and the Cauchy-Riemann operator. The work has been aimed at describing normal correct narrowings of operators under investigation and at investigating their spectrum. Described have been normal correct narrowings for some ordinary differential operators with constant and operator coefficients. Investigated have been the spectra of normal correct narrowings for the Cauchy-Riemann operator on a circle and square. The area of usage: the theory of boundary-value problems, spectral theory of differential operatorsAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio