rewrite > iota_ltb in Hw; apply (p2bF ? ? (eqP nat_eqType ? ?));
unfold Not; intros (Enw); rewrite > Enw in Hw;
rewrite > ltb_refl in Hw; destruct Hw]
rewrite > iota_ltb in Hw; apply (p2bF ? ? (eqP nat_eqType ? ?));
unfold Not; intros (Enw); rewrite > Enw in Hw;
rewrite > ltb_refl in Hw; destruct Hw]