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Today:
and then we give a name to this area:
where P is a partition of the interval [a,b]:
where is the width of the largest subinterval, for the partition.
This is a preview of section 6.2, p. 315 -- the Mean Value Theorem for Integrals. A couple of theorems from this section fall right out based on this idea:
From which we can derive the following bounds on an integral: if , then
It says that to integrate, all you have to do is think of an antiderivative F of the integrand f.