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We present FUEL (Fractional Universal Evaluation Library), a C++ library forperforming rational function arithmetic with a flexible choice of third-partycomputer algebra systems as simplifiers. FUEL is an outgrowth of a C++interface to Fermat which was originally part of the FIRE code forintegration-by-parts (IBP) reduction for Feynman integrals, now promoted to bea standalone library and with access to simplifiers other than Fermat. Wecompare the performance of various simplifiers for standalone benchmarkproblems as well as IBP reduction runs with FIRE. A speedup of more than 10times is achieved for an example IBP problem related to off-shellthree-particle form factors in $\mathcal N=4$ super-Yang-Mills theory.

Rational Function Simplification for Integration-by-Parts Reduction and Beyond