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The MPFI library is used by Macaulay2 for its arbitrary precision real interval arithmetic and associated transcendental functions. It is available at The library is based on the MPFR library. The library is remarkable for the care taken to return correctly rounded results. It is hoped that this will form a good base for experimentation with algebraic algorithms that mix symbolic and numeric techniques. It is licensed under the GNU Lesser General Public License, version 3 or later.