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In 2013, Henn proposed a special basis for a certain class of masterintegrals, which are expressible in terms of iterated integrals. In this basis,the master integrals obey a differential equation, where the right hand side isproportional to $\epsilon$ in $d=4-2\epsilon$ space-time dimensions. Analgorithmic approach to find such a basis was found by Lee. We present the toolepsilon, an efficient implementation of Lee's algorithm based on the Fermatcomputer algebra system as computational backend.

epsilon: A tool to find a canonical basis of master integrals