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I just want to clarify since it was my post that started this whole
discussion in the first place.
I understand that angular position can be changed without violating
conservation of angular momentum (i.e. the cat landing on its feet),
however, it seemed to me as I watched the diving that the divers were
terminating an existing rotation and it was THAT which seemed to violate
the law. I thought perhaps they were merely slowing the rotation by means
of changing their moment of inertia but it really seemed that the rotation
stopped.