Lecture 11 - Double Integrals and Fubini's Theorem
Idea behind Fubini's Theorem. Try sliding m (in which case you would need to activate j, k, l, n) or p (and activate o, q, r s) to see how the cross sections change in each direction.
Example 2: f(x,y) = y*sin(x) on [0,pi/2] x [0,1]