Bakkot comments on Proofs, Implications, and Models - Less Wrong
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Come to think of it, apples don't actually satisfy the ring axioms. In particular, if you have at least one apple, there is no number of apples I can give you such that you no longer have any apples.
Nor is it obvious how multiplication of apples should work. Apples might be considered an infinite cyclic abelian monoid, if you like, but it's beside the point - the point is that once you know what axioms they satisfy, you now know a whole bunch of stuff.
Well, if you have a row of 3 apples, and you get another three rows, you'll have 9 apples. But multiplying 3 apples by 3 apples would result in 9 apples^2; and I don't know what those look like.