(* Constructions with gr_tls ************************************************)
-lemma gr_isf_tls (n) (f): ð\9d\90\85â\9dªfâ\9d« â\86\92 ð\9d\90\85â\9dªâ«±*[n]f❫.
+lemma gr_isf_tls (n) (f): ð\9d\90\85â\9dªfâ\9d« â\86\92 ð\9d\90\85â\9dªâ«°*[n]f❫.
#n @(nat_ind_succ … n) -n /3 width=1 by gr_isf_tl/
qed.
(* Inversions with gr_tls ***************************************************)
(*** isfin_inv_tls *)
-lemma gr_isf_inv_tls (n) (g): ð\9d\90\85â\9dªâ«±*[n]g❫ → 𝐅❪g❫.
+lemma gr_isf_inv_tls (n) (g): ð\9d\90\85â\9dªâ«°*[n]g❫ → 𝐅❪g❫.
#n @(nat_ind_succ … n) -n /3 width=1 by gr_isf_inv_tl/
qed-.