End Equiv.
(** * Vector space *)
(** is_domin is a vector space *)
Section Domin.
Context {T : Type} {Ku Kv : AbsRing}
{U : NormedModule Ku} {V : NormedModule Kv}.

Lemma is_domin_le {F G} (f : T -> U) (g : T -> V) :
is_domin F f g -> filter_le G F -> is_domin G f g.