Resolution:
## Figure 2.
Inversions. (Top) There are four inversions required to translate the sorted list [1 2 3 4] into the
permutation [3 4 1 2]. The sum of the digits of the factoradic give the number of
inversions required to translate one permutation into another. (Bottom) The grey squares indicate the set of permutations that have a single inversion distance
from the original (black) permutations.
Magis and Price |