Proof of proveit.numbers.modular.complete_interval_right_shift_image_size theorem

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

%proving complete_interval_right_shift_image_size

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