Proof of proveit.logic.booleans.implication.iff_via_both_false theorem

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

%proving iff_via_both_false

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

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