2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54491The effective average actions for gauge theories and the associated nonperturbative evolution equations which govern their renormalization group flow are reviewed and various applications are described. As an example of a topological field theory, Chern-Simons theory is discussed in detail.25 pages, latexHigh Energy Physics - Theorytext