The names and notation we use for mathematics may be social constructs, but math itself is not.

No matter what you call it, 1 + 1 = 2. If you take a planet, and put another planet next to it, you have two planets. The circumference of a circle is pi * r * 2 no matter who is computing it, as long as they live under the same physics as we do. Even if we all believe it to be otherwise, it won't be that way.