(* Constructions with gr_tl *************************************************)
-lemma gr_isu_tl (f): ð\9d\90\94â\9dªfâ\9d« â\86\92 ð\9d\90\94â\9dªâ«±f❫.
+lemma gr_isu_tl (f): ð\9d\90\94â\9dªfâ\9d« â\86\92 ð\9d\90\94â\9dªâ«°f❫.
#f cases (gr_map_split_tl f) * #H
[ /3 width=3 by gr_isu_inv_push, gr_isu_isi/
| /2 width=3 by gr_isu_inv_next/