# On a Schur-type Algorithm for Sequences of Complex $${p} \times{q}$$ -matrices and its Interrelations with the Canonical Hankel Parametrization

Ontology type: schema:Chapter

### Chapter Info

DATE

2012

AUTHORS ABSTRACT

Building on work started in [12], we further examine the structure of the set $$\mathcal{H}^{\geq}_{q,2n}$$of all Hankel non-negative definite sequences $${(s_j)}^{2n}_{j=0}$$of complex $$q \times q$$-matrices. We furthermore examine the important subclasses $${\mathcal{H}^{{\geq},e}_{q,2n}}$$ and $$\mathcal{H}^{\geq}_{q,2n}$$, consisting of all Hankel non-negative definite and Hankel positive definite extendable sequences, respectively. These sequence-classes appear naturally when discussing matrix versions of the truncated Hamburger moment problem. In [12] and [15] a canonical Hankel parametrization $$[{(C_k)^n_{k=1}},{(D_k)^n_{k=0}}],$$consisting of two sequences of complex matrices, was associated with every sequence $${(s_j)}^{2n}_{j=0}$$ of complex $$p \times q$$-matrices. There is a bijective correspondence between the sequence and its canonical Hankel parametrization Chen and Hu [9] constructed a Schur-type algorithm for a special class of holomorphic matrix-valued functions in the upper half-plane so that matrix versions of the truncated Hamburger moment problem might be dealt with in the degenerate and non-degenerate cases, simultaneously. A closer analysis of their algorithm showed that it implicitly contains an interesting procedure for sequences belonging $${\mathcal{H}^{{\geq},e}_{q,2n}}$$This procedure serves as the focus of our work here, although we have chosen a slightly different and more general setting. Our approach is based on a suitable extension of the concept of reciprocal sequences, which are used in power series inversions. We will show that, given n as a positive integer, this concept rests on a particular method for producing sequences belonging to $${\mathcal{H}^{{\geq}}_{q,2n}}$$, starting from a sequence $${{(s_j)}^{2n}_{j=0}}\; \in \;{{\mathcal{H}^{{\geq}}_{q,2n}}}$$.Using this, we develop a Schur-type algorithm for finite sequences of complex $$p \times q$$-matrices. We show that the Schur-type algorithm preserves specific subclasses of $${\mathcal{H}^{{\geq}}_{q,2n}}$$, for example: $${\mathcal{H}^{{\geq},e}_{q,2n}}$$ $${\mathcal{H}^{{\geq}}_{q,2n}}$$. One of our main results (see Theorem 9.15) expresses that, given a sequence $${{(s_j)}^{2n}_{j=0}}\; \in \;{{\mathcal{H}^{{\geq},e}_{q,2n}}}$$, the Schur-type algorithm produces, exactly, its canonical Hankel parametrization. This leads us to a deeper understanding of the canonical Hankel parametrization. More... »

PAGES

117-192

### Book

TITLE

Interpolation, Schur Functions and Moment Problems II

ISBN

978-3-0348-0427-1
978-3-0348-0428-8

### Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-3-0348-0428-8_3

DOI

http://dx.doi.org/10.1007/978-3-0348-0428-8_3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1035254759

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