Definition Fulp (p : float) :=
  powerRZ radix (Fexp (Fnormalize radix b precision p)).

Theorem div2IsBetweenPos : forall p min max : float, (0 <= p)%R -> Fbounded b p -> isMin b radix (/ 2%nat * p) min -> isMax b radix (/ 2%nat * p) max -> p = (min + max)%R :>R.