proposition: Lemma mmap1 : 1^[f,h] = 1.
proof: Proof. by rewrite mmapC rmorph1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap