Definition Fnormalize (p : float) :=
  match Z_zerop (Fnum p) with
  | left _ => Float 0 (- dExp b)
  | right _ =>
      Fshift radix
        (min (precision - Fdigit radix p) (Zabs_nat (dExp b + Fexp p))) p
  end.

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