Local Notation rGf := morphpre_repr.
Section Stabiliser.
Variables (m : nat) (U : 'M[R]_(m, n)).

(* Specifications: *)
Lemma rstab_morphpre : rstab rGf U = f @*^-1 (rstab rG U).
Canonical rconj_repr := MxRepresentation rconj_mx_repr.