intros x H; (cut (0 < nNormMin)%Z; [ intros Z1 | apply nNormPos ]).
repeat split; simpl in |- *; auto with zarith.
rewrite Zabs_eq; auto with zarith.
rewrite PosNormMin.
pattern nNormMin at 1 in |- *; replace nNormMin with (1 * nNormMin)%Z;
auto with zarith.
apply Zmult_gt_0_lt_compat_r; auto with zarith.
rewrite PosNormMin; auto with zarith.
Qed.

Theorem FcanonicNnormMin :
forall x : Z, (- dExp b <= x)%Z -> Fcanonic (Float nNormMin x).