Variable n' : nat.
Local Notation n := n'.+1.Definition matrix_unitRingMixin :=
  UnitRingMixin (@mulVmx n) (@mulmxV n) (@intro_unitmx n

(* Specifications: *)
(* Lemmas requiring that the coefficients are in
Proof. exact: unitmx_tr. Qed.
Qed.
Implicit Types u v : {'GL_
Lemma GL_1E : GLval 1 = 1. Proof. by [
Lemma GL_VE u : GLval u^-1 = (GLval u)^-1. Proof. by
Lemma GL_VxE u : GLval u^-1 = invmx u. Pro