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If the demon predicts something and it does not happen, that just demonstrates that the demon is a fake.

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Determinism holds that it is theoretiically possible to make 100% accurate predictions about the future. The demon is just a thought experiment to help us examine and discuss that issue as well as other issue associated with determinism. To facilitate this we assume the demon is not a fake.

I agree with you that in a "real life" situation we would have to consider the possibility the demon is a fake.

Stu

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If you did something other than the demon said you would, then determinism would be rendered false. Note, the unpredictability of the future does not in and of itself prove free will true AND I hold it true that you could not disobey the demon (I think we established this earlier, sorry to repeat myself).