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Mp00190: Signed permutations Foata-HanSigned permutations
St001428: Signed permutations ⟶ ℤResult quality: 100% values known / values provided: 100%distinct values known / distinct values provided: 100%
Values
[1] => [1] => 0
[-1] => [-1] => 1
[1,2] => [1,2] => 0
[1,-2] => [1,-2] => 3
[-1,2] => [-1,2] => 1
[-1,-2] => [-1,-2] => 4
[2,1] => [-2,1] => 2
[2,-1] => [-2,-1] => 3
[-2,1] => [2,1] => 1
[-2,-1] => [2,-1] => 2
[1,2,3] => [1,2,3] => 0
[1,2,-3] => [1,2,-3] => 5
[1,-2,3] => [1,-2,3] => 3
[1,-2,-3] => [1,-2,-3] => 8
[-1,2,3] => [-1,2,3] => 1
[-1,2,-3] => [-1,2,-3] => 6
[-1,-2,3] => [-1,-2,3] => 4
[-1,-2,-3] => [-1,-2,-3] => 9
[1,3,2] => [1,-3,2] => 4
[1,3,-2] => [3,1,-2] => 5
[1,-3,2] => [-3,1,2] => 3
[1,-3,-2] => [1,3,-2] => 4
[-1,3,2] => [-1,-3,2] => 5
[-1,3,-2] => [3,-1,-2] => 6
[-1,-3,2] => [-3,-1,2] => 4
[-1,-3,-2] => [-1,3,-2] => 5
[2,1,3] => [-2,1,3] => 2
[2,1,-3] => [-2,1,-3] => 7
[2,-1,3] => [-2,-1,3] => 3
[2,-1,-3] => [-2,-1,-3] => 8
[-2,1,3] => [2,1,3] => 1
[-2,1,-3] => [2,1,-3] => 6
[-2,-1,3] => [2,-1,3] => 2
[-2,-1,-3] => [2,-1,-3] => 7
[2,3,1] => [3,-2,1] => 4
[2,3,-1] => [3,-2,-1] => 5
[2,-3,1] => [3,2,1] => 3
[2,-3,-1] => [3,2,-1] => 4
[-2,3,1] => [-3,-2,1] => 5
[-2,3,-1] => [-3,-2,-1] => 6
[-2,-3,1] => [-3,2,1] => 4
[-2,-3,-1] => [-3,2,-1] => 5
[3,1,2] => [3,1,2] => 2
[3,1,-2] => [1,-3,-2] => 7
[3,-1,2] => [3,-1,2] => 3
[3,-1,-2] => [-1,-3,-2] => 8
[-3,1,2] => [1,3,2] => 1
[-3,1,-2] => [-3,1,-2] => 6
[-3,-1,2] => [-1,3,2] => 2
[-3,-1,-2] => [-3,-1,-2] => 7
Description
The number of B-inversions of a signed permutation. The number of B-inversions of a signed permutation $\sigma$ of length $n$ is $$ \operatorname{inv}_B(\sigma) = \big|\{ 1 \leq i < j \leq n \mid \sigma(i) > \sigma(j) \}\big| + \big|\{ 1 \leq i \leq j \leq n \mid \sigma(-i) > \sigma(j) \}\big|, $$ see [1, Eq. (8.2)]. According to [1, Eq. (8.4)], this is the Coxeter length of $\sigma$.
St001433: Signed permutations ⟶ ℤResult quality: 53% values known / values provided: 53%distinct values known / distinct values provided: 94%
Values
[1] => 0
[-1] => 1
[1,2] => 0
[1,-2] => 3
[-1,2] => 1
[-1,-2] => 4
[2,1] => 2
[2,-1] => 3
[-2,1] => 1
[-2,-1] => 2
[1,2,3] => 0
[1,2,-3] => 5
[1,-2,3] => 3
[1,-2,-3] => 8
[-1,2,3] => 1
[-1,2,-3] => 6
[-1,-2,3] => 4
[-1,-2,-3] => 9
[1,3,2] => 4
[1,3,-2] => 5
[1,-3,2] => 3
[1,-3,-2] => 4
[-1,3,2] => 5
[-1,3,-2] => 6
[-1,-3,2] => 4
[-1,-3,-2] => 5
[2,1,3] => 2
[2,1,-3] => 7
[2,-1,3] => 3
[2,-1,-3] => 8
[-2,1,3] => 1
[-2,1,-3] => 6
[-2,-1,3] => 2
[-2,-1,-3] => 7
[2,3,1] => 4
[2,3,-1] => 5
[2,-3,1] => 3
[2,-3,-1] => 4
[-2,3,1] => 5
[-2,3,-1] => 6
[-2,-3,1] => 4
[-2,-3,-1] => 5
[3,1,2] => 2
[3,1,-2] => 7
[3,-1,2] => 3
[3,-1,-2] => 8
[-3,1,2] => 1
[-3,1,-2] => 6
[-3,-1,2] => 2
[-3,-1,-2] => 7
[1,2,3,4,5] => ? = 0
[1,2,3,4,-5] => ? = 9
[-1,2,3,4,5] => ? = 1
[1,2,3,5,-4] => ? = 9
[1,2,3,-5,-4] => ? = 8
[1,2,4,5,-3] => ? = 9
[1,2,4,-5,-3] => ? = 8
[1,2,5,-4,-3] => ? = 8
[1,2,-5,-4,-3] => ? = 7
[1,3,4,5,-2] => ? = 9
[1,3,4,-5,-2] => ? = 8
[1,3,-5,2,4] => ? = 5
[-1,3,-5,2,4] => ? = 6
[1,3,5,-4,-2] => ? = 8
[1,3,-5,-4,-2] => ? = 7
[1,-4,2,3,5] => ? = 3
[1,-4,2,3,-5] => ? = 12
[-1,-4,2,3,5] => ? = 4
[1,4,-5,2,3] => ? = 5
[-1,4,-5,2,3] => ? = 6
[1,4,5,-3,-2] => ? = 8
[1,4,-5,-3,-2] => ? = 7
[1,5,2,3,4] => ? = 4
[1,-5,2,3,4] => ? = 3
[-1,5,2,3,4] => ? = 5
[-1,-5,2,3,4] => ? = 4
[1,-5,-4,2,3] => ? = 4
[-1,-5,-4,2,3] => ? = 5
[1,5,-4,-3,-2] => ? = 7
[1,-5,-4,-3,-2] => ? = 6
[-2,1,3,4,5] => ? = 1
[-2,1,3,4,-5] => ? = 10
[-2,-1,3,4,5] => ? = 2
[-2,1,3,5,-4] => ? = 10
[-2,1,3,-5,-4] => ? = 9
[-2,1,4,5,-3] => ? = 10
[-2,1,4,-5,-3] => ? = 9
[-2,1,5,-4,-3] => ? = 9
[-2,1,-5,-4,-3] => ? = 8
[2,-3,1,4,5] => ? = 3
[2,-3,1,4,-5] => ? = 12
[2,-3,-1,4,5] => ? = 4
[2,-3,1,5,-4] => ? = 12
[2,-3,1,-5,-4] => ? = 11
[2,3,-4,1,5] => ? = 5
[2,3,-4,1,-5] => ? = 14
[2,3,-4,-1,5] => ? = 6
[2,3,4,-5,1] => ? = 7
[2,3,4,-5,-1] => ? = 8
[2,3,-5,1,4] => ? = 5
Description
The flag major index of a signed permutation. The flag major index of a signed permutation $\sigma$ is: $$\operatorname{fmaj}(\sigma)=\operatorname{neg}(\sigma)+2\cdot \sum_{i\in \operatorname{Des}_B(\sigma)}{i} ,$$ where $\operatorname{Des}_B(\sigma)$ is the $B$-descent set of $\sigma$; see [1, Eq.(10)]. This statistic is equidistributed with the $B$-inversions ([[St001428]]) and with the negative major index on the groups of signed permutations (see [1, Corollary 4.6]).