[NoToP]

Psst, the math joke here is that "the point at infinity" is literally the mathematicians version of folding in "this is an error case" with "valid coordinates". The "error case" in question being division by zero. Turns out there is good reason to do it, because it means the co-ordinate is always defined.

[martinky24]

If you have to explain the joke...

[NoToP]

Explaining a joke is like dissecting a frog. You understand it better, but the frog dies in the process.

[dwattttt]

I'd also add that I appreciate a good maths joke, but that's far outweighed by an irrational (in degree) anger at APIs where the error case is a member of the success cases type