  One-loop scattering amplitudes in N=4 super Yang-Mills (SYM) theories are
analyzed in the paradigm of maximal helicity violating Feynman diagrams. There
are very limited number of loop integrals to be evaluated. For a process with n
external particles, there are only [n/2]-1 generically independent integrals.
Furthermore, the relations between leading N_c amplitudes A_{n;1} and
sub-leading amplitudes A_{n;c} are found to be identical to those obtained from
conventional field theory calculations, which can be interpreted as an indirect
support for the paradigm.
