Complex GamQ(a, x) = Upper Regularized Incomplete Gamma Function


If a == 0 and x == 0, GamQ(0, 0) = 1.

Else if a == 0 and x != 0, GamQ(0, x!=0) = 0.

Else if a is a real integer < 0,

if x == 0, "Cannot take GamQ(a, 0) if a is an integer < 0.
Else GamQ(−int, x!=0) = 0.

Else if a.i == 0 and x.i == 0 and a.r != −int and x.r > 0, use the real GamQ(a.r, x.r) function.

Else GamQ(a, x) = GamU(a, x) / Gam(a).

See: Regularized Gamma Function -- From MathWorld
And: Wolfram Function Evaluation -- GammaRegularized (GamQ(a, x) = GammaRegularized[a, x])

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This page accessed times since Feb 13, 2006.
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Changes last made on Monday, 06-Aug-07 16:15:41 PDT

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