[bocablkr]

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I'm talking randomness in the most extreme definition. Basically I'm saying that we have to assign probablities for things like atom decay simply because we don't have enough knowledge to know the outcome.

The randomness I am talking about only exists if such predictions are literally impossible even with complete knowledge of the system.

If this randomness does not exist, then the entire history of the universe has already been determined.

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What you are saying is if someone had all the knowledge of the universe he could accurately predict every event at every instance of time. However, that would require an outside observer, outside of the universe. Once inside, his own thought process would effect the events and disrupt the predictions. Therefore, some degree of randomness will always exist and thus so will free will.