The evaluation of the matrix elements of the Coulomb interaction in calculations using the Lippmann–Schwinger (or related) equations is complicated by the existence of a singularity in the integrand. One method of handling this singularity is to use a procedure commonly called the Lande subtraction. A procedure is outlined which relates the subtraction integrals to formulae involving the zeros ...

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This documentation describes the PCC(FD) library v.0. that can be downloaded from http://www.irisa.fr/lande/petit/index.en.html. The library has been built upon SICStus 3.11.0 [2].