Identifier
-
Mp00080:
Set partitions
—to permutation⟶
Permutations
Mp00090: Permutations —cycle-as-one-line notation⟶ Permutations
St000004: Permutations ⟶ ℤ
Values
{{1}} => [1] => [1] => 0
{{1,2}} => [2,1] => [1,2] => 0
{{1},{2}} => [1,2] => [1,2] => 0
{{1,2,3}} => [2,3,1] => [1,2,3] => 0
{{1,2},{3}} => [2,1,3] => [1,2,3] => 0
{{1,3},{2}} => [3,2,1] => [1,3,2] => 2
{{1},{2,3}} => [1,3,2] => [1,2,3] => 0
{{1},{2},{3}} => [1,2,3] => [1,2,3] => 0
{{1,2,3,4}} => [2,3,4,1] => [1,2,3,4] => 0
{{1,2,3},{4}} => [2,3,1,4] => [1,2,3,4] => 0
{{1,2,4},{3}} => [2,4,3,1] => [1,2,4,3] => 3
{{1,2},{3,4}} => [2,1,4,3] => [1,2,3,4] => 0
{{1,2},{3},{4}} => [2,1,3,4] => [1,2,3,4] => 0
{{1,3,4},{2}} => [3,2,4,1] => [1,3,4,2] => 3
{{1,3},{2,4}} => [3,4,1,2] => [1,3,2,4] => 2
{{1,3},{2},{4}} => [3,2,1,4] => [1,3,2,4] => 2
{{1,4},{2,3}} => [4,3,2,1] => [1,4,2,3] => 2
{{1},{2,3,4}} => [1,3,4,2] => [1,2,3,4] => 0
{{1},{2,3},{4}} => [1,3,2,4] => [1,2,3,4] => 0
{{1,4},{2},{3}} => [4,2,3,1] => [1,4,2,3] => 2
{{1},{2,4},{3}} => [1,4,3,2] => [1,2,4,3] => 3
{{1},{2},{3,4}} => [1,2,4,3] => [1,2,3,4] => 0
{{1},{2},{3},{4}} => [1,2,3,4] => [1,2,3,4] => 0
{{1,2,3,4,5}} => [2,3,4,5,1] => [1,2,3,4,5] => 0
{{1,2,3,4},{5}} => [2,3,4,1,5] => [1,2,3,4,5] => 0
{{1,2,3,5},{4}} => [2,3,5,4,1] => [1,2,3,5,4] => 4
{{1,2,3},{4,5}} => [2,3,1,5,4] => [1,2,3,4,5] => 0
{{1,2,3},{4},{5}} => [2,3,1,4,5] => [1,2,3,4,5] => 0
{{1,2,4,5},{3}} => [2,4,3,5,1] => [1,2,4,5,3] => 4
{{1,2,4},{3,5}} => [2,4,5,1,3] => [1,2,4,3,5] => 3
{{1,2,4},{3},{5}} => [2,4,3,1,5] => [1,2,4,3,5] => 3
{{1,2,5},{3,4}} => [2,5,4,3,1] => [1,2,5,3,4] => 3
{{1,2},{3,4,5}} => [2,1,4,5,3] => [1,2,3,4,5] => 0
{{1,2},{3,4},{5}} => [2,1,4,3,5] => [1,2,3,4,5] => 0
{{1,2,5},{3},{4}} => [2,5,3,4,1] => [1,2,5,3,4] => 3
{{1,2},{3,5},{4}} => [2,1,5,4,3] => [1,2,3,5,4] => 4
{{1,2},{3},{4,5}} => [2,1,3,5,4] => [1,2,3,4,5] => 0
{{1,2},{3},{4},{5}} => [2,1,3,4,5] => [1,2,3,4,5] => 0
{{1,3,4,5},{2}} => [3,2,4,5,1] => [1,3,4,5,2] => 4
{{1,3,4},{2,5}} => [3,5,4,1,2] => [1,3,4,2,5] => 3
{{1,3,4},{2},{5}} => [3,2,4,1,5] => [1,3,4,2,5] => 3
{{1,3,5},{2,4}} => [3,4,5,2,1] => [1,3,5,2,4] => 3
{{1,3},{2,4,5}} => [3,4,1,5,2] => [1,3,2,4,5] => 2
{{1,3},{2,4},{5}} => [3,4,1,2,5] => [1,3,2,4,5] => 2
{{1,3,5},{2},{4}} => [3,2,5,4,1] => [1,3,5,2,4] => 3
{{1,3},{2,5},{4}} => [3,5,1,4,2] => [1,3,2,5,4] => 6
{{1,3},{2},{4,5}} => [3,2,1,5,4] => [1,3,2,4,5] => 2
{{1,3},{2},{4},{5}} => [3,2,1,4,5] => [1,3,2,4,5] => 2
{{1,4,5},{2,3}} => [4,3,2,5,1] => [1,4,5,2,3] => 3
{{1,4},{2,3,5}} => [4,3,5,1,2] => [1,4,2,3,5] => 2
{{1,4},{2,3},{5}} => [4,3,2,1,5] => [1,4,2,3,5] => 2
{{1,5},{2,3,4}} => [5,3,4,2,1] => [1,5,2,3,4] => 2
{{1},{2,3,4,5}} => [1,3,4,5,2] => [1,2,3,4,5] => 0
{{1},{2,3,4},{5}} => [1,3,4,2,5] => [1,2,3,4,5] => 0
{{1,5},{2,3},{4}} => [5,3,2,4,1] => [1,5,2,3,4] => 2
{{1},{2,3,5},{4}} => [1,3,5,4,2] => [1,2,3,5,4] => 4
{{1},{2,3},{4,5}} => [1,3,2,5,4] => [1,2,3,4,5] => 0
{{1},{2,3},{4},{5}} => [1,3,2,4,5] => [1,2,3,4,5] => 0
{{1,4,5},{2},{3}} => [4,2,3,5,1] => [1,4,5,2,3] => 3
{{1,4},{2,5},{3}} => [4,5,3,1,2] => [1,4,2,5,3] => 6
{{1,4},{2},{3,5}} => [4,2,5,1,3] => [1,4,2,3,5] => 2
{{1,4},{2},{3},{5}} => [4,2,3,1,5] => [1,4,2,3,5] => 2
{{1,5},{2,4},{3}} => [5,4,3,2,1] => [1,5,2,4,3] => 6
{{1},{2,4,5},{3}} => [1,4,3,5,2] => [1,2,4,5,3] => 4
{{1},{2,4},{3,5}} => [1,4,5,2,3] => [1,2,4,3,5] => 3
{{1},{2,4},{3},{5}} => [1,4,3,2,5] => [1,2,4,3,5] => 3
{{1,5},{2},{3,4}} => [5,2,4,3,1] => [1,5,2,3,4] => 2
{{1},{2,5},{3,4}} => [1,5,4,3,2] => [1,2,5,3,4] => 3
{{1},{2},{3,4,5}} => [1,2,4,5,3] => [1,2,3,4,5] => 0
{{1},{2},{3,4},{5}} => [1,2,4,3,5] => [1,2,3,4,5] => 0
{{1,5},{2},{3},{4}} => [5,2,3,4,1] => [1,5,2,3,4] => 2
{{1},{2,5},{3},{4}} => [1,5,3,4,2] => [1,2,5,3,4] => 3
{{1},{2},{3,5},{4}} => [1,2,5,4,3] => [1,2,3,5,4] => 4
{{1},{2},{3},{4,5}} => [1,2,3,5,4] => [1,2,3,4,5] => 0
{{1},{2},{3},{4},{5}} => [1,2,3,4,5] => [1,2,3,4,5] => 0
{{1,2,3,4,5,6}} => [2,3,4,5,6,1] => [1,2,3,4,5,6] => 0
{{1,2,3,4,5},{6}} => [2,3,4,5,1,6] => [1,2,3,4,5,6] => 0
{{1,2,3,4,6},{5}} => [2,3,4,6,5,1] => [1,2,3,4,6,5] => 5
{{1,2,3,4},{5,6}} => [2,3,4,1,6,5] => [1,2,3,4,5,6] => 0
{{1,2,3,4},{5},{6}} => [2,3,4,1,5,6] => [1,2,3,4,5,6] => 0
{{1,2,3,5,6},{4}} => [2,3,5,4,6,1] => [1,2,3,5,6,4] => 5
{{1,2,3,5},{4,6}} => [2,3,5,6,1,4] => [1,2,3,5,4,6] => 4
{{1,2,3,5},{4},{6}} => [2,3,5,4,1,6] => [1,2,3,5,4,6] => 4
{{1,2,3,6},{4,5}} => [2,3,6,5,4,1] => [1,2,3,6,4,5] => 4
{{1,2,3},{4,5,6}} => [2,3,1,5,6,4] => [1,2,3,4,5,6] => 0
{{1,2,3},{4,5},{6}} => [2,3,1,5,4,6] => [1,2,3,4,5,6] => 0
{{1,2,3,6},{4},{5}} => [2,3,6,4,5,1] => [1,2,3,6,4,5] => 4
{{1,2,3},{4,6},{5}} => [2,3,1,6,5,4] => [1,2,3,4,6,5] => 5
{{1,2,3},{4},{5,6}} => [2,3,1,4,6,5] => [1,2,3,4,5,6] => 0
{{1,2,3},{4},{5},{6}} => [2,3,1,4,5,6] => [1,2,3,4,5,6] => 0
{{1,2,4,5,6},{3}} => [2,4,3,5,6,1] => [1,2,4,5,6,3] => 5
{{1,2,4,5},{3,6}} => [2,4,6,5,1,3] => [1,2,4,5,3,6] => 4
{{1,2,4,5},{3},{6}} => [2,4,3,5,1,6] => [1,2,4,5,3,6] => 4
{{1,2,4,6},{3,5}} => [2,4,5,6,3,1] => [1,2,4,6,3,5] => 4
{{1,2,4},{3,5,6}} => [2,4,5,1,6,3] => [1,2,4,3,5,6] => 3
{{1,2,4},{3,5},{6}} => [2,4,5,1,3,6] => [1,2,4,3,5,6] => 3
{{1,2,4,6},{3},{5}} => [2,4,3,6,5,1] => [1,2,4,6,3,5] => 4
{{1,2,4},{3,6},{5}} => [2,4,6,1,5,3] => [1,2,4,3,6,5] => 8
{{1,2,4},{3},{5,6}} => [2,4,3,1,6,5] => [1,2,4,3,5,6] => 3
{{1,2,4},{3},{5},{6}} => [2,4,3,1,5,6] => [1,2,4,3,5,6] => 3
{{1,2,5,6},{3,4}} => [2,5,4,3,6,1] => [1,2,5,6,3,4] => 4
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Description
The major index of a permutation.
This is the sum of the positions of its descents,
$$\operatorname{maj}(\sigma) = \sum_{\sigma(i) > \sigma(i+1)} i.$$
Its generating function is $[n]_q! = [1]_q \cdot [2]_q \dots [n]_q$ for $[k]_q = 1 + q + q^2 + \dots q^{k-1}$.
A statistic equidistributed with the major index is called Mahonian statistic.
This is the sum of the positions of its descents,
$$\operatorname{maj}(\sigma) = \sum_{\sigma(i) > \sigma(i+1)} i.$$
Its generating function is $[n]_q! = [1]_q \cdot [2]_q \dots [n]_q$ for $[k]_q = 1 + q + q^2 + \dots q^{k-1}$.
A statistic equidistributed with the major index is called Mahonian statistic.
Map
to permutation
Description
Sends the set partition to the permutation obtained by considering the blocks as increasing cycles.
Map
cycle-as-one-line notation
Description
Return the permutation obtained by concatenating the cycles of a permutation, each written with minimal element first, sorted by minimal element.
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