proposition: Lemma mx_rsim_refl n (rG : reprG n) : mx_rsim rG rG.
proof: Proof. exists 1%:M => // [|x _]; first by rewrite row_free_unit unitmx1. by rewrite mulmx1 mul1mx. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop prime) mathcomp(ssralg poly polydiv finset fingroup morphism) mathcomp(perm automorphism quotient finalg action zmodp) mathcomp(commutator cyclic center pgroup matrix mxalgebra) mathcomp(mxpoly)