Proof of proveit.physics.quantum.algebra.unitarity_by_ortho_norm_bases_elements theorem

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

%proving unitarity_by_ortho_norm_bases_elements

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