proposition: Lemma mul1mor (phi : 'Mor(M,P)) : idm ** phi = phi.
proof: Proof. by apply: val_inj; rewrite /= mul1mx. 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