fact: Parameter equiv_add_context : forall p ctx s t, equiv s t -> is_a_pos ctx p = true -> equiv (replace_at_pos ctx s p) (replace_at_pos ctx t p).
imports: Coq(Bool Peano List PeanoNat) CoLoR(closure more_list equiv_list list_permut dickson) Coq(Relations Wellfounded Arith Wf_nat Recdef Program Morphisms Lia) CoLoR(term_spec term decidable_set ordered_set NatCompat)