proposition: Lemma fmuE i : fmu i = FMonom [:: i].
proof: Proof. by apply/eqP; rewrite fmP /fmu fmE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap