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by simonh 3569 days ago
Except if that were the case the quantum system could have a determined state, it just doesn't. But the Kochen-Specker theorem[0] proves that it cannot have a determined state. Quite possibly in any universe, though I'm not sure if that's been proven yet.

[0] https://en.wikipedia.org/wiki/Kochen%E2%80%93Specker_theorem