proposition: Lemma eqmor_sym : symmetric eqmor.
proof: Proof. by move=> phi1 phi2; rewrite /eqmor -dvdmxN opprB. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path) mathcomp(ssralg fintype perm choice matrix bigop zmodp mxalgebra poly) ssrcomplements stronglydiscrete coherent edr