That's our range we're going to think about. We're going to think about it in the abstract at first, and then we're going to try to come up with a formula for delta in terms of epsilon. How can we describe all of the x's that are in this range but not equal to 5 itself? We really care about the things that are within delta of 5 but not necessarily equal to 5. This is just a strictly less than. They're within a range of c but not equal to c. That's going to be all of the x's that satisfy x minus 5 is less than. Less than is less than delta.