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

Theorem roundedModeLessMult : forall (P : R -> float -> Prop) (p : float) (r : R), RoundedModeP b radix P -> P r p -> (Float 1%nat (- dExp b) <= r)%R -> (p <= radix * r)%R.