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A Computational Procedure for Incomplete Gamma Functions
1979
ACM Transactions on Mathematical Software
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We develop a computational procedure, based on Taylor's series and continued fractions, for evaluating Tncomi's incomplete gamma functmn 7*(a, x) = (x-"/F(a))S~ e-~t'-ldt and the complementary incomplete gamma function F(a, x) = $7 e-tt "-1 dt, suitably normalized, m the region x >_. 0, -oo < a < oo.
doi:10.1145/355853.355863
fatcat:k23rt3kbbrhq3e24e32sxpxrki