proposition: Lemma fmmulE m1 m2 : fmmul m1 m2 = FMonom (m1 ++ m2).
proof: Proof. by apply/eqP; rewrite fmP /fmmul 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