Literally undefined when x is equal to 1. So this is the function right over here. And so, once again, if someone were to ask you, what is f of 1, you'd go, and let's say that even if this was the function definition, you'd go, okay, x is equal to 1. Oh, wait, there's a gap in my function over here. It is undefined. So let me write it again. It's kind of redundant, but I'll rewrite it.