Just had one if these long discussions with a smart mathematician, and now I notice that sometimes I get the impression that computationalism (the only working philosophical edifice left) is non-obvious to 90% of people. I find that genuinely puzzling.
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To me this assertion appears to ignore the fact that even the computability of maths is conjecture not a fact ; so I would say that where you use 'must' in this and the following tweet, that 'I conjecture' would be more accurate?
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Mathematics is mostly uncomputable. The existence of turing universal computers that can do constructive math is an empirical fact.
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If we are dreams in God's mind, something must allow God's mind to progress in a non-random fashion and store its state. In other words, there must be some computer that runs the dreamer.
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Dualism entails two computational domains. For instance, dualism might allow you to act on this immediate moment in time by intermittently stopping the physical universe, letting the universe that computes your mind process your decision making, then update and commence physics.
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The great philosopher Douglas Noel Adams theorized in the 1970s that earth is a computational device to determine the question about life, the universe and everything in his seminal work "The Hitchhiker's Guide to the Galaxy".
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I may well be mistaken, but isn't that question begging? You're assuming the universe is/has a single substrate. A dualist might say there are two, with the computational laws of physics only capturing one.
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