Перегляд за автором "Kovalyov, I.M."

Сортувати за: Порядок: Результатів:

  • An operator approach to indefinite Stieltjes moment problem 
    Derkach, V.A.; Kovalyov, I.M. (Український математичний вісник, 2017)
    In the present paper we solve the indefinite Stieltjes moment problem MPkκ(s) within the M.G. Krein theory of u-resolvent matrices applied to a Pontryagin space symmetric operator A[0,N] generated by J[0,N]. The u-resolvent ...
  • A truncated indefinite Stieltjes moment problem 
    Kovalyov, I.M. (Український математичний вісник, 2016)
    A truncated indefinite Stieltjes moment problem in the class Nkκ of generalized Stieltjes functions is studied. The set of solutions of Stieltjes moment problem is described by Schur step-by-step algorithm, which is based ...
  • Shifted Darboux transformations of the generalized Jacobi matrices, I 
    Kovalyov, I.M. (Український математичний вісник, 2018)
    Let J be a monic generalized Jacobi matrix, i.e., a three-diagonal block matrix of a special form. We find conditions for a monic generalized Jacobi matrix J to admit a factorization J = LU + αI with L and U being lower ...