Identifier
- St000462: Permutations ⟶ ℤ
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] => 2
[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] => 4
[2,1,3,4] => 0
[2,1,4,3] => 2
[2,3,1,4] => 0
[2,3,4,1] => 0
[2,4,1,3] => 0
[2,4,3,1] => 3
[3,1,2,4] => 0
[3,1,4,2] => 2
[3,2,1,4] => 2
[3,2,4,1] => 2
[3,4,1,2] => 0
[3,4,2,1] => 3
[4,1,2,3] => 0
[4,1,3,2] => 3
[4,2,1,3] => 2
[4,2,3,1] => 3
[4,3,1,2] => 1
[4,3,2,1] => 4
[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] => 6
[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] => 1
[1,3,5,4,2] => 5
[1,4,2,3,5] => 1
[1,4,2,5,3] => 4
[1,4,3,2,5] => 4
[1,4,3,5,2] => 4
[1,4,5,2,3] => 1
[1,4,5,3,2] => 5
[1,5,2,3,4] => 1
[1,5,2,4,3] => 5
[1,5,3,2,4] => 4
[1,5,3,4,2] => 5
[1,5,4,2,3] => 3
[1,5,4,3,2] => 7
[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] => 6
[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] => 0
[2,3,5,4,1] => 4
[2,4,1,3,5] => 0
[2,4,1,5,3] => 3
[2,4,3,1,5] => 3
[2,4,3,5,1] => 3
[2,4,5,1,3] => 0
[2,4,5,3,1] => 4
[2,5,1,3,4] => 0
[2,5,1,4,3] => 4
[2,5,3,1,4] => 3
[2,5,3,4,1] => 4
[2,5,4,1,3] => 2
[2,5,4,3,1] => 6
[3,1,2,4,5] => 0
[3,1,2,5,4] => 3
[3,1,4,2,5] => 2
[3,1,4,5,2] => 2
[3,1,5,2,4] => 2
[3,1,5,4,2] => 6
[3,2,1,4,5] => 2
[3,2,1,5,4] => 5
[3,2,4,1,5] => 2
[3,2,4,5,1] => 2
[3,2,5,1,4] => 2
[3,2,5,4,1] => 6
[3,4,1,2,5] => 0
[3,4,1,5,2] => 3
[3,4,2,1,5] => 3
[3,4,2,5,1] => 3
[3,4,5,1,2] => 0
[3,4,5,2,1] => 4
[3,5,1,2,4] => 0
[3,5,1,4,2] => 4
[3,5,2,1,4] => 3
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Description
The major index minus the number of excedences of a permutation.
This occurs in the context of Eulerian polynomials [1].
This occurs in the context of Eulerian polynomials [1].
References
[1] Lin, Z., Zeng, J. The γ-positivity of basic Eulerian polynomials via group actions arXiv:1411.3397
Code
def statistic(pi):
exc = [pi_i for (i, pi_i) in enumerate(pi, 1) if pi_i > i]
return pi.major_index()-len(exc)
Created
Apr 07, 2016 at 12:09 by Martin Rubey
Updated
Apr 07, 2016 at 12:09 by Martin Rubey
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