intros p H' H'0; unfold FtoRradix, FtoR, firstNormalPos in |- *;
simpl in |- *.
replace (Fexp p) with (- dExp b)%Z.
2: apply sym_equal; case H'; intros H1 H2; case H2; auto.
apply Rmult_lt_compat_r; auto with real arith.
apply Rlt_IZR.
rewrite <- (Zabs_eq (Fnum p)).
2: apply LeR0Fnum with (radix := radix); auto with zarith.
apply pSubnormal_absolu_min; auto.
Qed.

Theorem FsubnormalnormalLtPos :
forall p q : float,
Fsubnormal p -> Fnormal q -> (0 <= p)%R -> (0 <= q)%R -> (p < q)%R.