proposition: Lemma mulmor1 (phi : 'Mor(M,P)) : phi ** idm = phi.
proof: Proof. by apply: val_inj; rewrite /= mulmx1. 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