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In [1]:
import proveit
theory = proveit.Theory() # the theorem's theory
In [2]:
%proving frac_cancel_left
With these allowed/disallowed theorem/theory presumptions (e.g., to avoid circular dependencies), we begin our proof of
frac_cancel_left:
(see dependencies)
frac_cancel_left may now be readily provable (assuming required theorems are usable).  Simply execute "%qed".