Section InvMorphism.
Variables (aT rT : finGroupType) (G : {group aT}) (f : {morphism G >-> rT}).
Variable R : {group rT}.
Hypothesis isoGR : isom G R f.

Lemma cfIsom_inj : injective (cfIsom isoGR). Proof. exact: can_inj cfIsomK. Qed.