On a Simultaneous Approach to the Even and Odd Truncated Matricial Stieltjes Moment Problem II. An $\alpha$-Schur-Stieltjes-type algorithm for sequences of holomorphic matrix-valued functions

TL;DR

This paper develops a unified Schur analysis-based approach to solve the even and odd truncated matricial Stieltjes moment problems, generalizing previous results for the case b5=0 and providing a comprehensive solution set description.

Contribution

It introduces a novel function-theoretic Schur-type algorithm for matrix-valued functions, extending prior algebraic methods to the most general case of the problem.

Findings

Complete description of the solution set for the moment problem.

Development of a new function-theoretic Schur algorithm.

Generalization of previous results to arbitrary b5 values.

Abstract

The main goal of this paper is to achieve a simultaneous treatment of the even and odd truncated matricial Stieltjes moment problems in the most general case. These results are generalizations of results of Chen and Hu [5,17] which considered the particular case $\alpha=0$. Our approach is based on Schur analysis methods. More precisely, we use two interrelated versions of Schur-type algorithms, namely an algebraic one and a function-theoretic one. The algebraic version was worked out in a former paper of the authors. It is an algorithm which is applied to finite or infinite sequences of complex matrices. The construction and investigation of the function-theoretic version of our Schur-type algorithm is a central theme of this paper. This algorithm will be applied to relevant subclasses of holomorphic matrix-valued functions of the Stieltjes class. Using recent results on the holomorphicity of the Moore-Penrose inverse of matrix-valued Stieltjes functions, we obtain a complete description of the solution set of the moment problem under consideration in the most general situation.