#[deprecated(since="8.16",note="Use Rinv_div.")]
Notation Rinv_Rdiv := Rinv_Rdiv_depr.

Theorem D_in_imp : forall (f g:R -> R) (D D1:R -> Prop) (x:R), (forall x:R, D1 x -> D x) -> D_in f g D x -> D_in f g D1 x.