proposition: Lemma mulmorDr (psi : 'Mor(M, N)) (phi1 phi2 : 'Mor(N, P)) : psi ** (phi1 + phi2)= psi ** phi1 + psi ** phi2.
proof: Proof. by apply: val_inj => /=; rewrite mulmxDr. 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