We consider asymptotics of orthogonal polynomials with respect to weights w(x)dx = e -Q(x) dx on the real line, where Q(x) = β 2m k=0 q k x k , q 2m > 0, denotes a polynomial of even order with positive leading coefficient. The orthogonal polynomial problem is formulated as a Riemann-Hilbert problem
Decomposition of Polynomials with Respect to the Cyclic Group of Orderm
β Scribed by A. Ronveaux; A. Zarzo; I. Area; E. Godoy
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 282 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0747-7171
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β¦ Synopsis
Given a polynomial solution of a differential equation, its m-ary decomposition, i.e. its decomposition as a sum of m polynomials P [j] (x) = k Ξ± j,k x Ξ» j,k containing only exponents Ξ» j,k with Ξ» j,k+1 -Ξ» j,k = m, is considered. A general algorithm is proposed in order to build holonomic equations for the m-ary parts P [j] (x) starting from the initial one, which, in addition, provides a factorized form of them. Moreover, these differential equations are used to compute expansions of the m-ary parts of a given polynomial in terms of classical orthogonal polynomials. As illustration, binary and ternary decomposition of these classical families are worked out in detail.
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