In this paper we prove a sharp version of the Moser-Trudinger inequality for
the Euler-Lagrange functional of a singular Toda system, motivated by the study
of models in Chern-Simons theory. Our result extends those for the scalar case,
as well as for the regular Toda system. We expect this inequality to be a basic
tool to attack variationally the existence problem under general assumptions.Comment: 13 pages, accepted on Bulletin of the Institute of Mathematica
Academia Sinic
