Universal computation is the set of rulesets that allow to implement all rulesets that allow universal computation. I suspect that hypercomputation lies outside of universal computation, but a-causal computation does not, i.e. hypercomputation cannot be implemented.
QM is what happens when you consider particles and space to be real and project one into the other.
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Not sure if particles are real, only in the sense that water waves are real. But it can be both at the same time.
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Yes, I think like water waves particles only have an approximate existence. The weird thing is that we are made from particles, so we also only exist approximately, with respect to the substrate. When we see the substrate decohere, it is actually us who are losing coherence.
End of conversation
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