I'm trying to get my words right. They say you can't do operations on infinity. Sorry I don't have an exact quote. But on the other hand you can do calculations involving infinite series. What is the proper way to describe what math can't do with infinity? I want to say something along the lines of you can't use math to determine how the singularity (Big Bang) existed forever because the singularity was infinite and you cannot use math to understand infinity.