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文章基本信息

  • 标题:On Linear Combinations of Two Orthogonal Polynomial Sequences on the Unit Circle
  • 本地全文:下载
  • 作者:C. Suárez
  • 期刊名称:Advances in Difference Equations
  • 印刷版ISSN:1687-1839
  • 电子版ISSN:1687-1847
  • 出版年度:2010
  • 卷号:2010
  • DOI:10.1155/2010/406231
  • 出版社:Hindawi Publishing Corporation
  • 摘要:

    Let { Φ n } be a monic orthogonal polynomial sequence on the unit circle. We define recursively a new sequence { Ψ n } of polynomials by the following linear combination: Ψ n ( z ) + p n Ψ n - 1 ( z ) = Φ n ( z ) + q n Φ n - 1 ( z ) , p n , q n ∈ ℂ , p n q n ≠ 0 . In this paper, we give necessary and sufficient conditions in order to make { Ψ n } be an orthogonal polynomial sequence too. Moreover, we obtain an explicit representation for the Verblunsky coefficients { Φ n ( 0 ) } and { Ψ n ( 0 ) } in terms of p n and q n . Finally, we show the relation between their corresponding Carathéodory functions and their associated linear functionals.

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