Identifier
- St001519: Permutations ⟶ ℤ
Values
[1] => 0
[1,2] => 0
[2,1] => 0
[1,2,3] => 0
[1,3,2] => 3
[2,1,3] => 0
[2,3,1] => 3
[3,1,2] => 0
[3,2,1] => 0
[1,2,3,4] => 0
[1,2,4,3] => 4
[1,3,2,4] => 3
[1,3,4,2] => 4
[1,4,2,3] => 4
[1,4,3,2] => 4
[2,1,3,4] => 0
[2,1,4,3] => 4
[2,3,1,4] => 3
[2,3,4,1] => 4
[2,4,1,3] => 4
[2,4,3,1] => 4
[3,1,2,4] => 0
[3,1,4,2] => 4
[3,2,1,4] => 0
[3,2,4,1] => 4
[3,4,1,2] => 4
[3,4,2,1] => 4
[4,1,2,3] => 0
[4,1,3,2] => 3
[4,2,1,3] => 0
[4,2,3,1] => 3
[4,3,1,2] => 0
[4,3,2,1] => 0
[1,2,3,4,5] => 0
[1,2,3,5,4] => 5
[1,2,4,3,5] => 4
[1,2,4,5,3] => 5
[1,2,5,3,4] => 5
[1,2,5,4,3] => 5
[1,3,2,4,5] => 3
[1,3,2,5,4] => 8
[1,3,4,2,5] => 4
[1,3,4,5,2] => 5
[1,3,5,2,4] => 5
[1,3,5,4,2] => 5
[1,4,2,3,5] => 4
[1,4,2,5,3] => 9
[1,4,3,2,5] => 4
[1,4,3,5,2] => 9
[1,4,5,2,3] => 5
[1,4,5,3,2] => 5
[1,5,2,3,4] => 5
[1,5,2,4,3] => 9
[1,5,3,2,4] => 5
[1,5,3,4,2] => 9
[1,5,4,2,3] => 5
[1,5,4,3,2] => 5
[2,1,3,4,5] => 0
[2,1,3,5,4] => 5
[2,1,4,3,5] => 4
[2,1,4,5,3] => 5
[2,1,5,3,4] => 5
[2,1,5,4,3] => 5
[2,3,1,4,5] => 3
[2,3,1,5,4] => 8
[2,3,4,1,5] => 4
[2,3,4,5,1] => 5
[2,3,5,1,4] => 5
[2,3,5,4,1] => 5
[2,4,1,3,5] => 4
[2,4,1,5,3] => 9
[2,4,3,1,5] => 4
[2,4,3,5,1] => 9
[2,4,5,1,3] => 5
[2,4,5,3,1] => 5
[2,5,1,3,4] => 5
[2,5,1,4,3] => 9
[2,5,3,1,4] => 5
[2,5,3,4,1] => 9
[2,5,4,1,3] => 5
[2,5,4,3,1] => 5
[3,1,2,4,5] => 0
[3,1,2,5,4] => 5
[3,1,4,2,5] => 4
[3,1,4,5,2] => 5
[3,1,5,2,4] => 5
[3,1,5,4,2] => 5
[3,2,1,4,5] => 0
[3,2,1,5,4] => 5
[3,2,4,1,5] => 4
[3,2,4,5,1] => 5
[3,2,5,1,4] => 5
[3,2,5,4,1] => 5
[3,4,1,2,5] => 4
[3,4,1,5,2] => 9
[3,4,2,1,5] => 4
[3,4,2,5,1] => 9
[3,4,5,1,2] => 5
[3,4,5,2,1] => 5
[3,5,1,2,4] => 5
[3,5,1,4,2] => 9
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Description
The pinnacle sum of a permutation.
This is, the sum of the pinnacles (peak values) given by
$$\sum_{i \text{ peak of } \sigma} \sigma(i).$$
This is, the sum of the pinnacles (peak values) given by
$$\sum_{i \text{ peak of } \sigma} \sigma(i).$$
References
[1] Davis, R., Nelson, S. A., Petersen, T. K., Tenner, B. E. The pinnacle set of a permutation arXiv:1704.05494
Code
def statistic(pi):
return sum( pi[i] for i in pi.peaks() )
Created
Feb 17, 2020 at 09:20 by Christian Stump
Updated
Feb 17, 2020 at 09:20 by Christian Stump
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