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zero_call comments on The role of mathematical truths - Less Wrong
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Any physical system that, as best you can infer, behaves with a known isomorphism to integer math.
**ETA: Oops, see zero_call's correction; following the article, integer math actually corresponds to some widely-held conception -- within human brains -- of how numbers work. Since Tyrrell_McAllister's point was that I was slipping in non-physicality, the rest of the exchange is still relevant, though.
No, I thought the physical referent for the integer math was something like "Human mental instantiation of an idea that is reasonably agreed upon." I believe you are referring to the physical referent of the preimage of the isomorphism (i.e., the physical system itself. A somewhat redundant thing to call a referent, since it is actually the explicit meaning of the statement.)
You're right, I agree. I was being inconsistent with my article there.