2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50493We show that keeping only the topologically trivial contribution to the average of a class function on U(N) amounts to integrating over its algebra. The goal is reached first by decompactifying an expansion over the instanton basis and then directly, by means of a geometrical procedure.11 pages, revtexHigh Energy Physics - Theorytext