Well, sure, because the term "math" already presupposes a lot. There are two possibilities, here: 1) Math describes reality, so human math and alien math are t

Well, sure, because the term "math" already presupposes a lot. There are two possibilities, here: 1) Math describes reality, so human math and alien math are the same thing, just different perspectives of reality and so, ultimately compatible. 2) Math is a language that humans use to describe their perceptions of reality to other humans. Perception is not reality, but a kind of isomorphism or pared-down heuristic, driven as it is by the evolutionary imperative to streamline for survival. Therefore a language that appears to be universal will only make sense to entities that employ the same perceptual framework for understanding, which is to say, human beings. I agree that something that is "true" in human math will not be directly "false" in an alien math. 2+2 really does equal 4. The question is whether 2+2=4 is relevant or even understandable to an alien.