proposition: Lemma fdeg_eq0 m : (fdeg m == 0%N) = (m == 1%M).
proof: Proof. exact/mf_eq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap