Proof of proveit.numbers.summation.integral_upper_bound_of_sum_lemma theorem

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

%proving integral_upper_bound_of_sum_lemma

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