proposition: Lemma lcmz0 : right_zero 0 lcmz.
proof: Proof. by move=> x; rewrite /lcmz absz0 lcmn0. 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)