We never defined it. This definition of the function doesn't tell us what to do with 1. It's literally undefined. 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.