fact: Parameter matching_is_sound : forall t1 t2 Wt1 Wt2 sigma, In sigma (matching t1 t2 Wt1 Wt2) -> apply_cf_subst sigma t1 = t2.
imports: Coq(Arith List Wellfounded Wf_nat) CoLoR(more_list list_permut list_sort term_spec term_o equational_theory ac matching dickson matching_well_formed matching_well_founded matching_sound matching_complete dickson)