Abstract
The results on characterization of orthogonal polynomials and Szegö polynomials via tridiagonal matrices and unitary Hessenberg matrices, respectively, are classical. In a recent paper we observed that tridiagonal matrices and unitary Hessenberg matrices both belong to a wider class of \((H,1)\)-quasiseparable matrices and derived a complete characterization of the latter class via polynomials satisfying certain EGO-type recurrence relations. We also established a characterization of polynomials satisfying three-term recurrence relations via \((H,1)\)-well-free matrices and of polynomials satisfying the Szegö-type two-term recurrence relations via \((H,1)\)-semiseparable matrices. In this paper we generalize all of these results from \(scalar\) (H,1) to the block (H, m) case. Specifically, we provide a complete characterization of \((H,\,m)\)-quasiseparable matrices via polynomials satisfying \(block\) EGO-type two-term recurrence relations. Further, \((H,\,m)\)-semiseparable matrices are completely characterized by the polynomials obeying \(block\) Szegö-type recurrence relations. Finally, we completely characterize polynomials satisfying m-term recurrence relations via a new class of matrices called \((H,\,m)\)-well-free matrices.
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Notes
- 1.
More details on the meaning of these numbers will be provided in Sect. 2.2.1.
- 2.
\(A_{12}=A(1:k,k+1:n), k=1,\ldots, n-1\) in the MATLAB notation.
- 3.
The parameters \(\mu_k\) associated with the Szegö polynomials are defined by \(\mu_k=\sqrt{1-|\rho_k|^2}\) for \(0\leq|\rho_k|<1\) and \(\mu_k=1\) for \(|\rho_k|=1,\) and since \(|\rho_k|\leq1\) for all \(k,\) we always have \(\mu_k\neq0.\)
- 4.
Every \(i\)-th row of B equals the row number \((i-1)\) times \( \rho_{i-1}^{*} / \rho_{i-2}^{*} \mu_{i-1}. \)
- 5.
The invertibility of \(b_k\) implies that all \(b_k\) are square \(m\times m\) matrices.
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Bella, T., Olshevsky, V., Zhlobich, P. (2011). Classifications of Recurrence Relations via Subclasses of (H, m)-quasiseparable Matrices. In: Van Dooren, P., Bhattacharyya, S., Chan, R., Olshevsky, V., Routray, A. (eds) Numerical Linear Algebra in Signals, Systems and Control. Lecture Notes in Electrical Engineering, vol 80. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0602-6_2
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