Some problems in loop calculations

Abstract

We discuss some of the problems that may occur in the calculation of complicated Feynman diagrams. These include the group independent evaluation of color factors, and the summation techniques that are needed for the expansion of diagrams into their Mellin moments.

Comments: 8 pages, LaTeX, uses appb.sty and axodraw.sty, talk given at 'Loops and Legs in gauge theories', Rheinsberg 1998