fact: Definition nat_mult_perm021 : ∏ n0 n1 n2, n0 * n1 * n2 = n0 * n2 * n1 := λ n0 n1 n2, pathscomp0 (pathscomp0 (natmultassoc n0 n1 n2) (maponpaths (λ z, n0 * z) (natmultcomm n1 n2))) (pathsinv0 (natmultassoc n0 n2 n1)).
imports: UniMath.Foundations.NaturalNumbers UniMath.Tactics.Utilities UniMath.Tactics.Abmonoids_Tactics