On Wed, 1 Sep 2021, David M. Warme wrote: > Does anybody know of a good open-source implementation > of PSLQ in C or C++ that uses GMP / MPFR? Did you try a simple google search for pslq+gmp? The first answer is a program written by one of the authors of MPFR... Further you can find https://trac.sagemath.org/ticket/853 with a good discussion. -- Marc Glisse