Arithmetical reality theories like comp and Tegmark's MUH assume that the
only things that exist are those that must exist (in this case some simple
numerical relations). This seems to me to be a good starting hypothesis -
show that some specific thing must exist, such as the facts of simple
arithmetic, and see what happens. Descartes tried this when he started with
his own thoughts (i.e., as we generally assume, with the idea of
computation). Which is pretty darn close to assuming just abstract
relations exist...

My favourite answer to the question "Why is there something rather than
nothing?" is "There isn't!"

(See "Theory of nothing" for more details.)

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