Module KI:=KI'.Definition F: functor := CovariantFunctor_MixVariantFunctor KI.F.Definition other := KI.other.Definition Rel A := @eq (F A).

Lemma Rel_fmap : forall A B (f:A -> B) (s:B -> A) x y, Rel A x y -> Rel B (fmap F f s x) (fmap F f s y).