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Originally Posted by JonnyBGood
What do you mean by this exactly? I think it's a fairly key element of quantum mechanics that you can't know both the position and velocity of a particle.(
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This isnt relevant though. Laplacian determinism isnt an epistemic claim about the knowledge it is possible to achieve, it is a metaphysical statement about casuation. LD states that if you can acquire full knowledge of the state of the universe at time t, then (with infintie computational power), you could deduce the states at time t+n for all n. In other words, the universe evolves in an entirely deterministic manner from any set of initial conditions. The fact that this knowledge is impossible to achieve doesnt make any difference - LD is a hypothetical thought experiment geared towards highlighting what is being claimed by physical determinism. Or to put it another way, ¬x doesnt falsify the conditional (x=>y).
Some interpretations of QM postulate genuine randomness which would disprove LD, but lol underdetermination lol. Things like Bohmian mechanics are fully deterministic as far as I know.