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Gegenbauerpolynom

Inom matematiken är Gegenbauerpolynomen eller ultrasfäriska polynomen C(α)n(x) en serie ortogonala polynom. De generaliserar Legendrepolynomen och Tjebysjovpolynomen, och är specialfall av Jacobipolynomen. De är uppkallade efter Leopold Gegenbauer.

Karakteriseringar

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Det finns ett flertal karakteriseringar av Gegenbauerpolynomen.

α = 1/2 reducerar sig ekvationen till Legendres ekvation, och Gegenbauerpolynomen reducerar sig till Legendrepolynomen.
Utskrivet lyder formeln
där är Pochhammersymbolen.
Av det följer Rodrigues formel:

Askey–Gaspers olikhet för Gegenbauerpolynomen är

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, Gegenbauer polynomials, 8 december 2013.
  • Bayin, S.S. (2006), Mathematical Methods in Science and Engineering, Wiley , Chapter 5
  • Koornwinder, Tom H.; Wong, Roderick S. C.; Koekoek, Roelof; Swarttouw, René F. (2010), ”Orthogonal Polynomials”, i Olver, Frank W. J.; Lozier, Daniel M.; Boisvert, Ronald F. m.fl., NIST Handbook of Mathematical Functions, Cambridge University Press, MR 2723248, ISBN 978-0521192255 
  • Stein, Elias; Weiss, Guido (1971), Introduction to Fourier Analysis on Euclidean Spaces, Princeton, N.J.: Princeton University Press, ISBN 978-0-691-08078-9 
  • Suetin, P.K. (2001), ”Ultraspherical polynomials”, i Hazewinkel, Michiel, Encyclopedia of Mathematics, Springer, ISBN 978-1556080104 

Externa länkar

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Gegenbauerpolynom
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