On Logic and Alternate Universes

[Alex K]

I'm still not sure how you have arrived at that truth. Logically speaking (i.e. using the logic that we hold dear to), we can rule out the logical possibility of concept(2) + concept(2) = concept(5). As such, even if it was somehow true that logic is wrong in this case, it would be true despite our logic. But if it is true despite our logic, then I'm not sure how we can ever know it's true.

We can't arrive at that truth using our logic, because our logic only works in this universe. But in a universe governed by goblygoop, 2 + 2 does equal 5. They could ask the same questions about our answer being 4, or not?

It really depends on how you define your terms whether the question makes sense or is just tautological. What do you mean by "2", by "4", by "5" and by "+"? This is why in my post above I started with the basics how we in this world formally arrive at the natural numbers and addition. If you define 4 as the result of the operation 2+2, then 2+2=4 is just tautologically true. So how do you define 4?