PrefixExchangeDistance on Permutation
The star transpositions (1 i) needed to sort p: the moved points, plus the nontrivial cycles, less two when 1 is moved.
Called as CombinatorialStat(x, "PrefixExchangeDistance"). The head's page has its examples.
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FindStat St001077
The prefix exchange distance of a permutation.
| Object | Value |
|---|---|
[1,2] | 0 |
[2,1] | 1 |
[1,2,3] | 0 |
[1,3,2] | 3 |
[2,1,3] | 1 |
[2,3,1] | 2 |
[3,1,2] | 2 |
[3,2,1] | 1 |
Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St001077 has the rest.