Less than is less than delta. That describes all of these x's right over here. What we're going to do, and the way these proofs typically go, is we're going to try to manipulate the left-hand side of the inequality so it starts to look something like this, or it starts to look exactly like that. As we do that, the right-hand side of the inequality is going to be expressed in terms of delta. Then we can essentially say, well, look, if the right-hand side looks like delta, or is in terms of delta, and the left-hand side looks just like that, that really defines how we can express delta in terms of epsilon. If that doesn't make sense, bear with me. I'm about to do it.