Hello,
I am trying to use the special function gsl_sf_hyperg_U_int(int
n, int m, double x) and it seems it is implemented only for x being
positive. Is it that true? I could not find any reference about that
on the manual. I have used mathematica and it is able to give a value
for x < 0 what makes me think that the function is well defined on
negative real numbers.
Thank you very much for your work and hlep,
Nacho.
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