FEYN CALC SYMBOL

# FCApart

is an internal function that partial fractions a loop integral (that depends on q1,q2,...) into integrals that contain only linearly independent propagators. The algorithm is largely based on the work and code of F. Feng (arXiv:1204.2314). FCApart is meant to be applied to single loop integrals only. If you need to perform partial fractioning on an expression that contains multiple loop integrals, use ApartFF