Constraints

    There are several constraints on the symmetry list that are checked by REDTEN, violating any of these will result in an error message.

• the block-size must be an integer.
• there must be at least two pointers to each independent symmetry.
• the pointers must be non-negative integers, the first index element corresponds to .
• the pointers must be in ascending order.
• blocks cannot overlap.
• the corresponding indextype sublists must be identical (unless the symmetry is a trace symmetry).
• a block cannot extend beyond the end of the index.

The user should be aware that the internal form of the symmetry list is somewhat different, and is held on the symmetry property of the object.