3.6 Special case: A and B are two adjacent but non-overlapping subsets
and A is denser than B. In order to maintain uniform inner-cluster
density distribution, L3 is the best cut. Traditional NCut fails to
cut along L3 as proven in Proposition 1. But LDAT can correct
the density bias of NCut and cut along L3. The effect of LDAT is
proven in Proposition 2. . . . . . . . . . . . . . . . . . . . . . . . 52