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Journal of Approximation Theory
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Journal of Approximation Theory
Article . 2014 . Peer-reviewed
License: Elsevier Non-Commercial
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Orthogonality and asymptotics of Pseudo-Jacobi polynomials for non-classical parameters

Authors: Jordaan, Kerstin Heidrun; Toókos, Ferenc;

Orthogonality and asymptotics of Pseudo-Jacobi polynomials for non-classical parameters

Abstract

The family of general Jacobi polynomials P"n^(^@a^,^@b^) where @a,@b@?C can be characterised by complex (non-Hermitian) orthogonality relations (cf. Kuijlaars et al. (2005)). The special subclass of Jacobi polynomials P"n^(^@a^,^@b^) where @a,@b@?R are classical and the real orthogonality, quasi-orthogonality as well as related properties, such as the behaviour of the n real zeros, have been well studied. There is another special subclass of Jacobi polynomials P"n^(^@a^,^@b^) with @a,@b@?C, @b=@a@? which are known as Pseudo-Jacobi polynomials. The sequence of Pseudo-Jacobi polynomials {P"n^@a^,^@a^@?}"n"="0^~ is the only other subclass in the general Jacobi family (beside the classical Jacobi polynomials) that has n real zeros for every n=0,1,2,... for certain values of @a@?C. For some parameter ranges Pseudo-Jacobi polynomials are fully orthogonal, for others there is only complex (non-Hermitian) orthogonality. We summarise the orthogonality and quasi-orthogonality properties and study the zeros of Pseudo-Jacobi polynomials, providing asymptotics, bounds and results on the monotonicity and convexity of the zeros.

Related Organizations
Keywords

Zeros, Orthogonal polynomials, Quasi-orthogonal polynomials, 511, Orthogonal polynomials; Quasi-orthogonal polynomials; Jacobi polynomials with complex parameters; Pseudo-Jacobi polynomials; Zeros, Pseudo-Jacobi polynomials, Jacobi polynomials with complex parameters

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
14
Top 10%
Average
Top 10%
hybrid