Full indefinite Stieltjes moment problem and Padé approximants
Date Issued
2020
Author(s)
Derkach, Volodymyr
Kovalyov, Ivan
Abstract
Full indefinite Stieltjes moment problem is studied via the step-by-step Schur algorithm. Naturally associated with indefinite Stieltjes moment problem are generalized Stieltjes continued fraction and a system of difference equations, which, in turn, lead to factorization of resolvent matrices of indefinite Stieltjes moment problem. A criterion for such a problem to be indeterminate in terms of continued fraction is found and a complete description of its solutions is given in the indeterminate case.
Explicit formulas for diagonal and sub-diagonal Pad´e approximants for formal power series corresponding to indefinite Stieltjes moment problem and convergence results for Pad´e approximants are presented.
Explicit formulas for diagonal and sub-diagonal Pad´e approximants for formal power series corresponding to indefinite Stieltjes moment problem and convergence results for Pad´e approximants are presented.
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