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pari

Starting with version 1.2, Macaulay2 incorporates pari, a free library for fast computations in number theory, available at http://pari.math.u-bordeaux.fr/, originally developed by Henri Cohen and his co-workers at Université Bordeaux I, France. It is used by factor(ZZ), factor(QQ), isPseudoprime(ZZ), and isPrime(ZZ). It is distributed under the terms of the GNU General Public License, version 2, see COPYING.