intros p H'; red in |- *; split.
unfold Fnormalize in |- *; case (Z_zerop (Fnum p)); auto.
intros H'0; simpl in |- *; auto with zarith.
intros H'0.
apply digitGivesBoundedNum; auto.
rewrite FshiftFdigit; auto.
apply le_trans with (m := Fdigit radix p + (precision - Fdigit radix p));
auto with arith.
rewrite <- le_plus_minus; auto.
apply pGivesDigit; auto.
unfold Fnormalize in |- *; case (Z_zerop (Fnum p)); auto.
simpl in |- *; auto with zarith.
generalize H'; case p; unfold Fbounded, Fnormal, Fdigit in |- *;
simpl in |- *.
intros Fnum1 Fexp1 H'0 H'1.
apply Zle_trans with (m := (Fexp1 - Zabs_nat (dExp b + Fexp1))%Z).
rewrite inj_abs; auto with zarith.
unfold Zminus in |- *; apply Zplus_le_compat_l; auto.
apply Zle_Zopp; auto.
apply inj_le; auto with arith.
Qed.

Theorem FnormalizeCanonic :
forall p : float, Fbounded b p -> Fcanonic (Fnormalize p).