And the first operation that I will do is called intersection. And so we would say x intersect the intersection of x and y. And the way that I think about this, this is going to yield another set that contains the elements that are in both x and y. So I often view this intersection symbol right here as and. So all of the things that are in x and in y. So what are those things going to be? Well, let's look at both sets x and y.