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army1987 comments on So you think you understand Quantum Mechanics - Less Wrong
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How can it be anything else? Even then, T would equal (CP)^-1.
Generally, you pick up a phase factor after CP^2. The story is exactly like parity (P) if you can embed P^2 in a continuous symmetry, you can define away the phase factor, but if you can't you are just stuck with it.
That's still in the reference class I called “boring stuff”, though.