And then we can sum them up. And that would give us an approximation for the area. But as long as we use a finite number, we might say, well, we can always get better by making our delta x's smaller, and then by having more of these rectangles. Or get to a situation, here we're going from i is equal to one to i is equal to n. But what happens is delta x gets thinner and thinner and thinner, and we have, and n gets larger and larger and larger. As delta x gets infinitesimally small, and then as n approaches infinity. And so you're probably sensing something. Then maybe we could think about the limit as we could say as n approaches infinity, or the limit as delta x becomes very, very, very, very small.