Well if the fundamental constants were different, math would still work the same way. But if a universe acts in a completely different way, say like a dream wor

Well if the fundamental constants were different, math would still work the same way. But if a universe acts in a completely different way, say like a dream world, where they is no logical physical causaulity, our universe's math would be irrelevant. You could still think about it but it would be irrelevant to that universe, and not applicable. And so you would also not be able to derive that math from within this universe, at least not the same math as ours. So we have to admit that our mathematics is tied to the universe we inhabit.