Section Morphim.
Variables (aT rT : finGroupType) (G D : {group aT}) (f : {morphism D >-> rT}).
Variables (n : nat) (rGf : mx_representation F (f @* G) n).
Hypothesis sGD : G \subset D.
Let sG_f'fG : G \subset f @*^-1 (f @* G).

Lemma morphim_mx_irr : (mx_irreducible rG <-> mx_irreducible rGf).