Definition pl_path_rec_equiv_1_def (plp : pl_path)
(pl : prec_list) :=
pl_path_incl plp pl ->
forall (d : preDTA) (tl : term_list) (n : nat),
pl_path_recon d tl plp -> pl_tl_length pl n -> liste_reconnait d pl tl.

Lemma pl_path_rec_length :
forall (plp : pl_path) (tl : term_list) (d : preDTA),
pl_path_recon d tl plp -> pl_path_length plp = lst_length tl.