Different ways to integrate more generally over regions
Stronger form of Fubini’s theorem
Examples
Volume between z = x2 + y2 + 1 and triangle
0 ≤ x ≤ 1 and y ≤ x
Volume between z = 2x + y + 2 over 0 ≤ y ≤ 1-x2
Small changes in this problem could put z < 0 over some of
the region of integration; to compute volume between z and
xy plane would then require splitting region to avoid negative
“volumes” cancelling positive ones