Section RND_FIX.
Variable beta : radix.
Notation bpow := (bpow beta).
Variable emin : Z.
Inductive FIX_format (x : R) : Prop :=
FIX_spec (f : float beta) :
x = F2R f -> (Fexp f = emin)%Z -> FIX_format x.
Definition FIX_exp (e : Z) := emin.
(** Properties of the FIX format *)
Global Instance FIX_exp_valid : Valid_exp FIX_exp.
Global Instance FIX_exp_monotone : Monotone_exp FIX_exp.

Theorem ulp_FIX :
forall x, ulp beta FIX_exp x = bpow emin.