Fungsi gamma: Béda antarrépisi

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==Harti==
 
The notationLambang Γ(''z'') isdumasar due toka [[Adrien-Marie Legendre]]. IfLamun thebagean real parttina ofwilangan the complex numberkompleks ''z'' is positivepositip, then themangka [[integral]]
:<math>
\Gamma(z) = \int_0^\infty t^{z-1}\,e^{-t}\,dt
</math>
convergespasti absolutelykonvergen. UsingMigunakeun [[integration by parts|integral parsial]], onebisa canditembongkeun showyen that
:<math>\Gamma(z+1)=z\Gamma(z)\,.</math>