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

Theorem PminPos : forall p min : float, (0 <= p)%R -> Fbounded b p -> isMin b radix (/ 2%nat * p) min -> exists c : float, Fbounded b c /\ c = (p - min)%R :>R.