Proof of proveit.numbers.absolute_value.abs_even_rev theorem

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

%proving abs_even_rev

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

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