So for example, if epsilon is 0.01, that says that you want f of x to be within 0.01 of epsilon. And so what I then do is I say, well, OK, you've given me that epsilon. I'm going to find you. I will find you another number, find another positive number, another number which we'll call delta, the lowercase delta, the Greek letter delta, such that, so I'll say where, if x is within delta of c, then f of x will be within epsilon of our limit. So let's see if these are really saying the same thing. And this yellow definition right over here, we said you can get f of x as close as you want to l by making x sufficiently close to c. This second definition, which I kind of made as a little bit more of a game, is doing the same thing. Someone is saying how close they want f of x to be to l. And the burden is then to find a delta where as long as x is within delta of c, then f of x will be within epsilon of the limit.