Fungsi gamma: Béda antarrépisi
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Baris ka-1:
[[Gambar:Gamma.png|thumb]]
[[Gambar:Gamma_abs.png|thumb]]
Dina [[matematik]], '''fungsi gamma'''
== Harti ==
Lambang Γ(''z'') dumasar ka [[Adrien-Marie Legendre]]. Lamun
:<math>
\Gamma(z) = \int_0^\infty t^{z-1}\,e^{-t}\,dt
</math>
pasti konvergen. Migunakeun [[integration by parts|integral parsial]], bisa ditembongkeun
:<math>\Gamma(z+1)=z\Gamma(z)\,.</math>
Baris ka-16:
:<math>\Gamma(n+1)=n!\,</math>
keur sakabeh [[natural number|wilangan natural]] ''n''. Ieu bisa
Hal nu leuwih lega ilaharna dumasar salaku fungsi gamma.
Notasi alternatip nu kadangkala
:<math>\Pi(z) = \Gamma(z+1) = z\Gamma(z).</math>
Kadangkala
:<math>\pi(z) = {1 \over \Pi(z)}\,</math>
nu
Bisa
:<math>\Gamma\left(\frac{1}{2}\right)=\sqrt{\pi}.</math>
Baris ka-36:
:<math>\operatorname{Res}(\Gamma,-n)=\frac{(-1)^n}{n!}.</math>
Bentuk kakali fungsi gamma saterusna
:<math>\Gamma(z) = \frac{e^{-\gamma z}}{z} \prod_{n=1}^\infty \left(1 + \frac{z}{n}\right)^{-1} e^{z/n}</math>
numana γ
[[Bohr-Mollerup theorem|TeoremaBohr-Mollerup]] nangtukeun
== Kaitan jeung fungsi sejen ==
Dina integral di luhur, nu ngahartikeun fungsi gamma, watesan integralna geus ditangtukeun.
[[incomplete gamma function|Fungsi gama nu teu lengkep]]
Turunan logaritma fungsi gamma disebutna [[digamma function|fungsi digamma]].
Baris ka-57:
* M. Abramowitz and I. A. Stegun, eds. ''Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables''. New York: Dover, 1972. ''(See Chapter 6.)''
* G. Arfken and H. Weber. ''Mathematical Methods for Physicists''. Harcourt/Academic Press, 2000. ''(See Chapter 10.)''
* W.H. Press, B.P. Flannery, S.A. Teukolsky, and W.T. Vetterling. ''Numerical Recipes in C''. Cambridge, UK: Cambridge University Press, 1988. ''(See Section 6.1.)''
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