2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149426A basis of Lorentz and gauge-invariant monomials in non--Abelian gauge theories with matter is described, applicable for the inverse mass expansion of effective actions. An algorithm to convert an arbitrarily given invariant expression into a linear combination of the basis elements is presented. The linear independence of the basis invariants is proven.21 pages, 2 figures, 15 tables; LaTeX, uses epsfig; figure in Table 5 and typo in Table 8 correctedHigh Energy Physics - Theorytext