HIP, a set of computer packages for symbolic calculation of Feynman diagrams, is presented. The packages were designed as an aid in calculating tree‐level multiparticle electroweak production processes, though they can be used for a much wider class of calculations. The packages have been used to calculate such processes as eγ→Wν and γγ→W+W at tree level with arbitrary Wγ couplings. The packages are written in the computer algebra language Mathematica, which provides a powerful working environment.

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