I am having trouble understanding the integral bounds.
From what side should my understanding go (first or second?):
first: as $z$ is between zero and one, $y$ is also between zero and one, thus $x$ is between $yz$ and one.
second:as $x$ is between $1$ and $yz$, $y$ is between 0 and one, and $z$ is between zero and one.
Does it even matter from which side I go ?