proposition: Lemma gcdz_idPl {m n} : reflect (gcdz m n = `|m|%:Z) (m %| n)%Z.
proof: Proof. by apply: (iffP gcdn_idPl) => [<- | []]. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop prime order) mathcomp(ssralg poly ssrnum ssrint archimedean rat matrix) mathcomp(polydiv perm zmodp mxalgebra vector)