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On 30 Sep 1999, Big Fish wrote: > I know what a hypergeometric function is, like the function > hypergeometric1F1[a,b,x] in Mathematica. But what does > Mathematica mean by > > hypergeometric1F1^(1,0,0)[a,b,x] ? It would be helpful if you could give us a context for the output that you are describing. Usually parenthesized superscripts like this refer to derivatives. See, for example, what you obtain when you evaluate D[Hypergeometric1F1[a, b, x], a] The (1, 0, 0) means that the function Hypergeometric1F1 has been differentiated once with respect to the first variable (a) , and zero times with respect to the others (b and x). -- P.J. Hinton Mathematica Programming Group paulh at wolfram.com Wolfram Research, Inc. Disclaimer: Opinions expressed herein are those of the author alone.