apply le_to_not_lt.apply lt_to_le.assumption.
intro.rewrite < H.rewrite > nat_compare_n_n.reflexivity.
intro.apply nat_compare_elim.intro.
apply le_to_not_lt.apply lt_to_le.assumption.
intro.rewrite < H.rewrite > nat_compare_n_n.reflexivity.
intro.apply nat_compare_elim.intro.