importproveittheory=proveit.Theory()# the theorem's theory
In [2]:
%proving nonmembership_fold_singleton
With these allowed/disallowed theorem/theory presumptions (e.g., to avoid circular dependencies), we begin our proof of nonmembership_fold_singleton: (see dependencies)
nonmembership_fold_singleton may now be readily provable (assuming required theorems are usable). Simply execute "%qed".