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Benedikt Vitecek <[log in to unmask]>
Sat, 11 Mar 2017 18:40:17 +0100
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> Concerning Gamma, the main reason I haven't implemented it yet is that
> it requires determining some magic constants that were only given to me
> for a lower precision than what I need (10 digits instead of 16).

For the Gamma function the book

  „Numerical Recipes: The art of Scientific Computing“ (3rd edition);
  William H. Press, Saul A. Teukolsky, William T. Vetterling, Brian P. Flannery;
  Cambridge University Press

might be of interest as it describes the implementation of a Gamma function with error smaller than < 1e-15.