On the perturbations in the E.Schmid's spectrum of the linear operators in Hilbert spaces.

In perturbation theory of discrete spectrum of Fredholm operators in the articles [5,6] it is suggested the regularization, allowing to reduce the multiple eigenvalues cases to simple ones. In this article the regularized perturbation methods among them in pseudoperturbation aspect on M.K.Gavurin [8] are applied to E.Schmidt spectral problems.