Proof of proveit.core_expr_types.tuples.len_of_empty_range_of_ranges theorem

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

%proving len_of_empty_range_of_ranges

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