Is it possible to find a close form(exact or approximate) for inverse of incomplete gamma function???
closed as not a real question by Bill Johnson, David Roberts, Chandan Singh Dalawat, Michael Renardy, Vladimir Dotsenko May 25 '12 at 14:50
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In this paper the authors give what they claim is a good approximation. (the paper is: Inverse Incomplete Gamma Function and its Application Mischa Dohler, Marylin Arndt)