fact: Parameter div_DN_correct : forall p x y, ((is_real_ub x /\ is_neg_real y) \/ (is_real_lb x /\ is_pos_real y)) -> valid_lb (div_DN p x y) = true /\ le_lower (toX (div_DN p x y)) (Xdiv (toX x) (toX y)).
imports: Coq(ZArith Reals) Flocq(Zaux Raux) Xreal Basic