Time inversions make me nervous, too.
Try magnetic space groups for that - really does make the brain hurt.
(
Colonel Boris "...a desperate Buzzfeed imitation...",
Fri 14 Mar 2008, 16:33,
archived)
magnetic space groups
Is that like a Fridge magnet of a 70's glam rock band?
(
chenobble rocking his explorer beard on,
Fri 14 Mar 2008, 16:36,
archived)