Prenex Implicits cfIsom.
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_eq1 phi : (cfIsom isoGR phi == 1) = (phi == 1).
Definition cfQuo phi := Cfun 1 (cfQuo_subproof phi).