search for: upperincompletegamma

...t I could find: http://www.r-project.org/nocvs/mail/r-help/2000/1006.html and http://www.r-project.org/nocvs/mail/r-help/2000/3618.html both of which suggest that the upper incomplete gamma can be obtained using the pgamma() function. Is Prof. Ripley's message (the first above) saying that upperIncompletegamma(x,\rate) = pgamma(x,\rate) * gamma(\rate) ? I have not yet been able to see why this would be true. I keep tripping myself up on the differing notation of R, mathworld, wikipaedia and Abramowitz and Stegun's "Handbook of mathematical functions". Would someone please confirm that thi...