I observe a state as \psi in my frame F. But if I hadn't, you might observe it as \psi' in your frame F'. Would we both be giving differing descriptions of the same state? Classically the answer is obviously "yes". But in QM this has profound implications. I have just posted a paper on this: https://www.researchgate.net/publication/317799816_Observer-Independent_States. Please let me know what you think.

Article Observer-Independent States

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