proposition: Lemma fdegU k : fdeg U_(k) = 1%N.
proof: Proof. by rewrite fdegE fmU. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap