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Identifier
Values
[1,2] => 0
[2,1] => 0
[1,2,3] => 0
[1,3,2] => 1
[2,1,3] => 0
[2,3,1] => 0
[3,1,2] => 0
[3,2,1] => 0
[1,2,3,4] => 0
[1,2,4,3] => 2
[1,3,2,4] => 1
[1,3,4,2] => 1
[1,4,2,3] => 1
[1,4,3,2] => 2
[2,1,3,4] => 0
[2,1,4,3] => 2
[2,3,1,4] => 0
[2,3,4,1] => 0
[2,4,1,3] => 1
[2,4,3,1] => 1
[3,1,2,4] => 0
[3,1,4,2] => 1
[3,2,1,4] => 0
[3,2,4,1] => 0
[3,4,1,2] => 0
[3,4,2,1] => 0
[4,1,2,3] => 0
[4,1,3,2] => 1
[4,2,1,3] => 0
[4,2,3,1] => 0
[4,3,1,2] => 0
[4,3,2,1] => 0
[1,2,3,4,5] => 0
[1,2,3,5,4] => 3
[1,2,4,3,5] => 2
[1,2,4,5,3] => 2
[1,2,5,3,4] => 2
[1,2,5,4,3] => 4
[1,3,2,4,5] => 1
[1,3,2,5,4] => 4
[1,3,4,2,5] => 1
[1,3,4,5,2] => 1
[1,3,5,2,4] => 3
[1,3,5,4,2] => 3
[1,4,2,3,5] => 1
[1,4,2,5,3] => 3
[1,4,3,2,5] => 2
[1,4,3,5,2] => 2
[1,4,5,2,3] => 2
[1,4,5,3,2] => 2
[1,5,2,3,4] => 1
[1,5,2,4,3] => 3
[1,5,3,2,4] => 2
[1,5,3,4,2] => 2
[1,5,4,2,3] => 2
[1,5,4,3,2] => 3
[2,1,3,4,5] => 0
[2,1,3,5,4] => 3
[2,1,4,3,5] => 2
[2,1,4,5,3] => 2
[2,1,5,3,4] => 2
[2,1,5,4,3] => 4
[2,3,1,4,5] => 0
[2,3,1,5,4] => 3
[2,3,4,1,5] => 0
[2,3,4,5,1] => 0
[2,3,5,1,4] => 2
[2,3,5,4,1] => 2
[2,4,1,3,5] => 1
[2,4,1,5,3] => 2
[2,4,3,1,5] => 1
[2,4,3,5,1] => 1
[2,4,5,1,3] => 1
[2,4,5,3,1] => 1
[2,5,1,3,4] => 1
[2,5,1,4,3] => 3
[2,5,3,1,4] => 1
[2,5,3,4,1] => 1
[2,5,4,1,3] => 2
[2,5,4,3,1] => 2
[3,1,2,4,5] => 0
[3,1,2,5,4] => 3
[3,1,4,2,5] => 1
[3,1,4,5,2] => 1
[3,1,5,2,4] => 2
[3,1,5,4,2] => 3
[3,2,1,4,5] => 0
[3,2,1,5,4] => 3
[3,2,4,1,5] => 0
[3,2,4,5,1] => 0
[3,2,5,1,4] => 2
[3,2,5,4,1] => 2
[3,4,1,2,5] => 0
[3,4,1,5,2] => 1
[3,4,2,1,5] => 0
[3,4,2,5,1] => 0
[3,4,5,1,2] => 0
[3,4,5,2,1] => 0
[3,5,1,2,4] => 1
[3,5,1,4,2] => 2
[3,5,2,1,4] => 1
>>> Load all 152 entries. <<<
[3,5,2,4,1] => 1
[3,5,4,1,2] => 1
[3,5,4,2,1] => 1
[4,1,2,3,5] => 0
[4,1,2,5,3] => 2
[4,1,3,2,5] => 1
[4,1,3,5,2] => 1
[4,1,5,2,3] => 1
[4,1,5,3,2] => 2
[4,2,1,3,5] => 0
[4,2,1,5,3] => 2
[4,2,3,1,5] => 0
[4,2,3,5,1] => 0
[4,2,5,1,3] => 1
[4,2,5,3,1] => 1
[4,3,1,2,5] => 0
[4,3,1,5,2] => 1
[4,3,2,1,5] => 0
[4,3,2,5,1] => 0
[4,3,5,1,2] => 0
[4,3,5,2,1] => 0
[4,5,1,2,3] => 0
[4,5,1,3,2] => 1
[4,5,2,1,3] => 0
[4,5,2,3,1] => 0
[4,5,3,1,2] => 0
[4,5,3,2,1] => 0
[5,1,2,3,4] => 0
[5,1,2,4,3] => 2
[5,1,3,2,4] => 1
[5,1,3,4,2] => 1
[5,1,4,2,3] => 1
[5,1,4,3,2] => 2
[5,2,1,3,4] => 0
[5,2,1,4,3] => 2
[5,2,3,1,4] => 0
[5,2,3,4,1] => 0
[5,2,4,1,3] => 1
[5,2,4,3,1] => 1
[5,3,1,2,4] => 0
[5,3,1,4,2] => 1
[5,3,2,1,4] => 0
[5,3,2,4,1] => 0
[5,3,4,1,2] => 0
[5,3,4,2,1] => 0
[5,4,1,2,3] => 0
[5,4,1,3,2] => 1
[5,4,2,1,3] => 0
[5,4,2,3,1] => 0
[5,4,3,1,2] => 0
[5,4,3,2,1] => 0
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Description
The Castelnuovo-Mumford regularity of a permutation.
The Castelnuovo-Mumford regularity of a permutation $\sigma$ is the Castelnuovo-Mumford regularity of the matrix Schubert variety $X_\sigma$.
Equivalently, it is the difference between the degrees of the Grothendieck polynomial and the Schubert polynomial for $\sigma$. It can be computed by subtracting the Coxeter length St000018The number of inversions of a permutation. from the Rajchgot index St001759The Rajchgot index of a permutation..
References
[1] Pechenik, O., E Speyer, D., Weigandt, A. Castelnuovo-Mumford regularity of matrix Schubert varieties arXiv:2111.10681
Code
def statistic(x):
    return max(v.major_index() for v in x.permutohedron_smaller()) - x.length()
Created
Jul 04, 2022 at 22:16 by Oliver Pechenik
Updated
Jul 05, 2022 at 10:54 by Martin Rubey