# Sieved orthogonal polynomials

In mathematics, **sieved orthogonal polynomials** are orthogonal polynomials whose recurrence relations are formed by sieving the recurrence relations of another family; in other words, some of the recurrence relations are replaced by simpler ones. The first examples were the sieved ultraspherical polynomials introduced by Waleed Al-Salam, W. R. Allaway, and Richard Askey (1984). Mourad Ismail later studied sieved orthogonal polynomials in a long series of papers. Other families of sieved orthogonal polynomials that have been studied include sieved Pollaczek polynomials, and sieved Jacobi polynomials.

## References

- Al-Salam, Waleed; Allaway, W. R.; Askey, Richard (1984), "Sieved ultraspherical polynomials",
*Transactions of the American Mathematical Society*,**284**(1): 39–55, CiteSeerX 10.1.1.308.3668, doi:10.2307/1999273, ISSN 0002-9947, JSTOR 1999273, MR 0742411

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