Geodesic
The leading term of the Plancherel-Rotach asymptotic formula for solutions of recurrence relations
Sbornik. Mathematics, Tome 205 (2014) no. 12, pp. 1696-1719 Cet article a éte moissonné depuis la source Math-Net.Ru

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Recurrence relations generating Padé and Hermite-Padé polynomials are considered. Their coefficients increase with the index of the relation, but after dividing by an appropriate power of the scaling function they tend to a finite limit. As a result, after scaling the polynomials ‘stabilize’ for large indices; this type of asymptotic behaviour is called Plancherel-Rotach asymptotics. An explicit expression for the leading term of the asymptotic formula, which is valid outside sets containing the zeros of the polynomials, is obtained for wide classes of three- and four-term relations. For three-term recurrence relations this result generalizes a theorem Van Assche obtained for recurrence relations with ‘regularly’ growing coefficients. Bibliography: 19 titles.
Keywords: high-order recurrence relations, difference operators.
Mots-clés : multiple orthogonal polynomials, Hermite-Padé approximants 
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A. I. Aptekarev; D. N. Tulyakov. The leading term of the Plancherel-Rotach asymptotic formula for solutions of recurrence relations. Sbornik. Mathematics, Tome 205 (2014) no. 12, pp. 1696-1719. http://geodesic.mathdoc.fr/item/SM_2014_205_12_a1/

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