(* Advanced constructions with pr_isi and pr_nat ****************************)
-lemma pr_isi_nat (f): (∀l. @↑❪l,f❫ ≘ l) → 𝐈❪f❫.
+lemma pr_isi_nat (f): (∀l. @§❨l,f❩ ≘ l) → 𝐈❨f❩.
/2 width=1 by pr_isi_pat/ qed.
(* Inversions with pr_nat ***************************************************)
-lemma pr_isi_inv_nat (f) (l): ð\9d\90\88â\9dªfâ\9d« â\86\92 @â\86\91â\9dªl,fâ\9d« ≘ l.
+lemma pr_isi_inv_nat (f) (l): ð\9d\90\88â\9d¨fâ\9d© â\86\92 ï¼ Â§â\9d¨l,fâ\9d© ≘ l.
/2 width=1 by pr_isi_inv_pat/ qed-.
(* Destructions with pr_nat *************************************************)
-lemma pr_isi_nat_des (f) (l1) (l2): ð\9d\90\88â\9dªfâ\9d« â\86\92 @â\86\91â\9dªl1,fâ\9d« ≘ l2 → l1 = l2.
+lemma pr_isi_nat_des (f) (l1) (l2): ð\9d\90\88â\9d¨fâ\9d© â\86\92 ï¼ Â§â\9d¨l1,fâ\9d© ≘ l2 → l1 = l2.
/3 width=3 by pr_isi_pat_des, eq_inv_npsucc_bi/ qed-.