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- W2953147366 abstract "Orthogonal polynomials on the unit circle are completely determined by their reflection coefficients through the Szegő recurrences. We assume that the reflection coefficients converge to some complex number a with 0 < |a| < 1. The polynomials then live essentially on the are {eiθ : α ≤ θ ≤ 2 π − α) where cos(α/2) [formula] with α ∈ (0, π). We analyze the orthogonal polynomials by comparing them with the orthogonal polynomials with constant reflection coefficients, which were studied earlier by Ya. L. Geronimus and N. I. Akhiezer. In particular, we show that under certain assumptions on the rate of convergence of the reflection coefficients the orthogonality measure will be absolutely continuous on the are. In addition, we also prove the unit circle analogue of M. G. Krein′s characterization of compactly supported nonnegative Borel measures on the real line whose support contains one single limit point in terms of the corresponding system of orthogonal polynomials." @default.
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- W2953147366 date "1995-12-01" @default.
- W2953147366 modified "2023-10-16" @default.
- W2953147366 title "Perturbation of Orthogonal Polynomials on an Arc of the Unit Circle" @default.
- W2953147366 doi "https://doi.org/10.1006/jath.1995.1128" @default.
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