In the fundamental postulate of quantum mechanics (page 18), there exists a one-to-one correspondence like that:
closed quantum system ↔ Hilbert space ; quantum state ↔ a ray in Hilbert space
but here the ray can carry some additional phase factor eiϕ? What's the observable influence due to the phase factor in state vector? I mean if you take inner product the redundant factor will disappear.
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