proposition: Lemma mmapC c : c%:MP^[f,h] = f c.
proof: Proof. by rewrite mmapU mmorph1 mulr1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap