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.
I would say that they have the existence of a ground truth that manifests as some regularity in observable phenomena as a prior, but this prior does not need to be taken on faith.
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–What about them makes 'ground truth' a more accurate name for them than 'ground belief'? –When you mention priors, you're thinking we can apply bayesian reasoning from our evidence of other minds & a reliable universe and hence have something firmer than mere belief?
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Once a belief is entirely conditional on its priors, it ceases to have any element of faith in it. I see rationalism as a Kantian program of reducing all beliefs entirely to priors, so all statements are conditional, and you know these conditions.
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