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Zbl 0532.33007
Lorch, Lee
Inequalities for ultraspherical polynomials and the gamma function.
(English)
[J] J. Approximation Theory 40, 115-120 (1984). ISSN 0021-9045

Der Verf. beweisst mit elementaren Mitteln für die Gegenbauerschen Polynome $P\sb n\sp{(\lambda)}$ die Abschätzung $$ (\sin \theta)\sp{\lambda}\vert P\sb n\sp{(\lambda)}(\cos \theta)\vert<2\sp{1- \lambda}/\Gamma(\lambda)(n+\lambda)\sp{1-\lambda},$$ $$0\le \theta \le \pi,\quad 0<\lambda<1,\quad n\in N.$$ Diese Abschätzung ist besser als {\it G. Szegö's} Ungleichung [Orthogonal polynomials (1959; Zbl 0089.275)], wo $n\sp{1-\lambda}$ statt $(n+\lambda)\sp{1-\lambda}$ steht. Einige Abschätzungen für $\Gamma(n+\lambda)/\Gamma(n+1)$ werden betrachtet.
[E.Riekstiņš]
MSC 2000:
*33C55 Elliptic integrals as hypergeometric functions
33B15 Gamma-functions, etc.

Citations: Zbl 0089.275

Cited in: Zbl 1004.33005 Zbl 0677.33001

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Highlights
Scientific prize winners of the ICM 2010
Overhang
Lie groups, physics and geometry. An introduction for physicists, engineers and chemists.

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