mpfi 1.5.4 C library for arbitrary-precision interval arithmetic

MPFI is a portable C library for arbitrary-precision interval arithmetic, with intervals represented using MPFR reliable floating-point numbers. It's based on the GMP and GNU<*ENTITY*>nbspMPFR libraries.

The purpose of arbitrary-precision interval arithmetic is to get results that are both guaranteed, thanks to interval computation, and accurate, thanks to multiple-precision arithmetic.