proposition: Lemma mcoeff_eq0 p m : (p@_m == 0) = (m \notin msupp p).
proof: Proof. by rewrite msuppE mem_dom /mcoeff negbK. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype tuple finfun bigop finset binomial) mathcomp(order fingroup perm ssralg zmodp poly ssrint) mathcomp(matrix vector) mathcomp(bigenough) ssrcomplements freeg