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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If a universe presents itself via discernible differences (information) and is regular enough for computation, then its substrate (if it has one) must necessarily and sufficiently be a computer, i.e. a system capable of regular state change with Turing universality.
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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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