intros x y H' H'0 H'1 H'2 H'3.
case (Rle_or_lt x y); auto.
intros H'4; case H'4; clear H'4; intros H'4.
case FcanonicLtNeg with (p := x) (q := y); auto.
intros H'5; Contradict H'3; auto with zarith.
intros H'5; elim H'5; intros H'6 H'7; clear H'5; Contradict H'3; rewrite H'6;
auto with zarith.
Contradict H'3.
rewrite FcanonicUnique with (p := x) (q := y); auto with zarith.
Qed.

Theorem FnormalBoundAbs2 :
forall p : float,
Fnormal p ->
(Zpos (vNum b) * Float 1%nat (Zpred (Fexp p)) <= Fabs p)%R.