Analytic Subtraction Applied to the Incomplete Gamma and Beta Functions
Marietta J. Tretter, G. William Walster · SIAM Journal on Scientific and Statistical Computing · 1980
The purpose of this paper is to draw attention to a method of performing analytic subtractions that can dramatically improve the numerical stability of a continued fraction (cf) or series expansion. The method is applied to the computation of the incomplete gamma and beta functions.