Ladder operators for Szegő polynomials and related biorthogonal rational functions

preprint1994arXivOpen access

We find the raising and lowering operators for orthogonal polynomials on the unit circle introduced by Szegő and for their four parameter generalization to ${}_4ϕ_3$ biorthogonal rational functions on the unit circle.

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Ladder operators for Szegő polynomials and related biorthogonal rational functions

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