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CD ROM Paradise Collection 4
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CD ROM Paradise Collection 4 1995 Nov.iso
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GAMMA.KEY
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1993-11-07
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445b
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11 lines
* gamma external
gamma(n) is the gamma function Γ(n),
gamma(n) = inte(t^(n-1)*e^(-t), t,0,inf), gamma(n) = (n-1)!.
gamma(n,x) is the incomplete gamma function, gamma(n,x) =
inte(t^n*e^(-t), t,0,x), d(gamma(n,x),x) = x^n*e^(-x).
gamma(n,0) = 0, gamma(n,inf) = gamma(n+1) = n!.
gamma(n,x) is similar to gamma(n), but its power term is t^n, instead
of t^(n-1).
See also: ei, erf, ci, si.