3 ms·

What if mathematics is different in other universes?

• kazinator 12y ago
  That is by definition what other universes are. Different rules and axioms generating different worlds. However, is there a universe in which, say, an object that is isomorphic to number theory in this universe has completely different theorems? Like, suppose that the natural numbers are defined in that universe exactly as we define them in this one, as is addition and multiplication and primeness, but the number 25 is found to be prime rather than composite? I would have to say "no" on that one.