Proof of proveit.numbers.number_sets.rational_numbers.nonpos_rational_is_rational_nonpos theorem

import proveit
theory = proveit.Theory() # the theorem's theory

%proving nonpos_rational_is_rational_nonpos

With these allowed/disallowed theorem/theory presumptions (e.g., to avoid circular dependencies), we begin our proof of
nonpos_rational_is_rational_nonpos:
(see dependencies)

nonpos_rational_is_rational_nonpos may now be readily provable (assuming required theorems are usable).  Simply execute "%qed".