(* Advanced constructions with pr_isi and pr_pat ****************************)
(*** isid_at *)
-lemma pr_isi_pat (f): (â\88\80i. @â\9dªi,fâ\9d« â\89\98 i) â\86\92 ð\9d\90\88â\9dªfâ\9d«.
+lemma pr_isi_pat (f): (â\88\80i. @â\9d¨i,fâ\9d© â\89\98 i) â\86\92 ð\9d\90\88â\9d¨fâ\9d©.
/3 width=1 by pr_eq_id_isi, pr_pat_inv_id/
qed.
(* Inversions with pr_pat ***************************************************)
(*** isid_inv_at *)
-lemma pr_isi_inv_pat (f) (i): ð\9d\90\88â\9dªfâ\9d« â\86\92 @â\9dªi,fâ\9d« ≘ i.
+lemma pr_isi_inv_pat (f) (i): ð\9d\90\88â\9d¨fâ\9d© â\86\92 @â\9d¨i,fâ\9d© ≘ i.
/3 width=3 by pr_isi_inv_eq_id, pr_pat_id, pr_pat_eq_repl_back/
qed-.
(* Destructions with pr_pat *************************************************)
(*** isid_inv_at_mono *)
-lemma pr_isi_pat_des (f) (i1) (i2): ð\9d\90\88â\9dªfâ\9d« â\86\92 @â\9dªi1,fâ\9d« ≘ i2 → i1 = i2.
+lemma pr_isi_pat_des (f) (i1) (i2): ð\9d\90\88â\9d¨fâ\9d© â\86\92 @â\9d¨i1,fâ\9d© ≘ i2 → i1 = i2.
/4 width=3 by pr_isi_inv_eq_id, pr_pat_id_des, pr_pat_eq_repl_fwd/
qed-.