Make H_tilde off diagonal blocks return zero by default
The algorithm's goal is to block-diagonalize. Therefore, I suggest that H_tilde[0, 1, ...] is zero by default, since we have enough tests to ensure that this is actually working.
The algorithm's goal is to block-diagonalize. Therefore, I suggest that H_tilde[0, 1, ...] is zero by default, since we have enough tests to ensure that this is actually working.