proposition: Lemma rstabs_abelemG (L : {group gT}) : L \subset E -> rstabs rG (rowg_mx (ErV @* L)) = 'N_G(L).
proof: Proof. by move=> sLE; rewrite rstabs_abelem rowg_mxK morphim_invm. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop prime) mathcomp(ssralg poly finset fingroup morphism perm) mathcomp(automorphism quotient gproduct action finalg) mathcomp(zmodp commutator cyclic center pgroup gseries) mathcomp(nilpotent sylow maximal abelian matrix) mathcomp(mxalgebra mxrepresentation)