Write it just like that. And I could write that a is less than or equal to c, which is less than or equal to b. And what I want to think about is, how does this definite integral relate to the definite integral from a to c and the definite integral from c to b? So let's think through that. So we have the definite integral from a to c of f of x. Actually, I've already used that purple color for the function itself. So I'm going to use green.