- FindStat

Identifier

Mp00080: Set partitions —to permutation⟶ Permutations
St001729: Permutations ⟶ ℤ

Values

{{1}} => [1] => 0

{{1,2}} => [2,1] => 1

{{1},{2}} => [1,2] => 0

{{1,2,3}} => [2,3,1] => 1

{{1,2},{3}} => [2,1,3] => 1

{{1,3},{2}} => [3,2,1] => 1

{{1},{2,3}} => [1,3,2] => 1

{{1},{2},{3}} => [1,2,3] => 0

{{1,2,3,4}} => [2,3,4,1] => 1

{{1,2,3},{4}} => [2,3,1,4] => 1

{{1,2,4},{3}} => [2,4,3,1] => 1

{{1,2},{3,4}} => [2,1,4,3] => 2

{{1,2},{3},{4}} => [2,1,3,4] => 1

{{1,3,4},{2}} => [3,2,4,1] => 1

{{1,3},{2,4}} => [3,4,1,2] => 1

{{1,3},{2},{4}} => [3,2,1,4] => 1

{{1,4},{2,3}} => [4,3,2,1] => 2

{{1},{2,3,4}} => [1,3,4,2] => 1

{{1},{2,3},{4}} => [1,3,2,4] => 1

{{1,4},{2},{3}} => [4,2,3,1] => 1

{{1},{2,4},{3}} => [1,4,3,2] => 1

{{1},{2},{3,4}} => [1,2,4,3] => 1

{{1},{2},{3},{4}} => [1,2,3,4] => 0

{{1,2,3,4,5}} => [2,3,4,5,1] => 1

{{1,2,3,4},{5}} => [2,3,4,1,5] => 1

{{1,2,3,5},{4}} => [2,3,5,4,1] => 1

{{1,2,3},{4,5}} => [2,3,1,5,4] => 2

{{1,2,3},{4},{5}} => [2,3,1,4,5] => 1

{{1,2,4,5},{3}} => [2,4,3,5,1] => 1

{{1,2,4},{3,5}} => [2,4,5,1,3] => 1

{{1,2,4},{3},{5}} => [2,4,3,1,5] => 1

{{1,2,5},{3,4}} => [2,5,4,3,1] => 2

{{1,2},{3,4,5}} => [2,1,4,5,3] => 2

{{1,2},{3,4},{5}} => [2,1,4,3,5] => 2

{{1,2,5},{3},{4}} => [2,5,3,4,1] => 1

{{1,2},{3,5},{4}} => [2,1,5,4,3] => 2

{{1,2},{3},{4,5}} => [2,1,3,5,4] => 2

{{1,2},{3},{4},{5}} => [2,1,3,4,5] => 1

{{1,3,4,5},{2}} => [3,2,4,5,1] => 1

{{1,3,4},{2,5}} => [3,5,4,1,2] => 1

{{1,3,4},{2},{5}} => [3,2,4,1,5] => 1

{{1,3,5},{2,4}} => [3,4,5,2,1] => 2

{{1,3},{2,4,5}} => [3,4,1,5,2] => 2

{{1,3},{2,4},{5}} => [3,4,1,2,5] => 1

{{1,3,5},{2},{4}} => [3,2,5,4,1] => 1

{{1,3},{2,5},{4}} => [3,5,1,4,2] => 2

{{1,3},{2},{4,5}} => [3,2,1,5,4] => 2

{{1,3},{2},{4},{5}} => [3,2,1,4,5] => 1

{{1,4,5},{2,3}} => [4,3,2,5,1] => 2

{{1,4},{2,3,5}} => [4,3,5,1,2] => 1

{{1,4},{2,3},{5}} => [4,3,2,1,5] => 2

{{1,5},{2,3,4}} => [5,3,4,2,1] => 2

{{1},{2,3,4,5}} => [1,3,4,5,2] => 1

{{1},{2,3,4},{5}} => [1,3,4,2,5] => 1

{{1,5},{2,3},{4}} => [5,3,2,4,1] => 2

{{1},{2,3,5},{4}} => [1,3,5,4,2] => 1

{{1},{2,3},{4,5}} => [1,3,2,5,4] => 2

{{1},{2,3},{4},{5}} => [1,3,2,4,5] => 1

{{1,4,5},{2},{3}} => [4,2,3,5,1] => 1

{{1,4},{2,5},{3}} => [4,5,3,1,2] => 1

{{1,4},{2},{3,5}} => [4,2,5,1,3] => 1

{{1,4},{2},{3},{5}} => [4,2,3,1,5] => 1

{{1,5},{2,4},{3}} => [5,4,3,2,1] => 2

{{1},{2,4,5},{3}} => [1,4,3,5,2] => 1

{{1},{2,4},{3,5}} => [1,4,5,2,3] => 1

{{1},{2,4},{3},{5}} => [1,4,3,2,5] => 1

{{1,5},{2},{3,4}} => [5,2,4,3,1] => 2

{{1},{2,5},{3,4}} => [1,5,4,3,2] => 2

{{1},{2},{3,4,5}} => [1,2,4,5,3] => 1

{{1},{2},{3,4},{5}} => [1,2,4,3,5] => 1

{{1,5},{2},{3},{4}} => [5,2,3,4,1] => 1

{{1},{2,5},{3},{4}} => [1,5,3,4,2] => 1

{{1},{2},{3,5},{4}} => [1,2,5,4,3] => 1

{{1},{2},{3},{4,5}} => [1,2,3,5,4] => 1

{{1},{2},{3},{4},{5}} => [1,2,3,4,5] => 0

{{1,2,3,4,5,6}} => [2,3,4,5,6,1] => 1

{{1,2,3,4,5},{6}} => [2,3,4,5,1,6] => 1

{{1,2,3,4,6},{5}} => [2,3,4,6,5,1] => 1

{{1,2,3,4},{5,6}} => [2,3,4,1,6,5] => 2

{{1,2,3,4},{5},{6}} => [2,3,4,1,5,6] => 1

{{1,2,3,5,6},{4}} => [2,3,5,4,6,1] => 1

{{1,2,3,5},{4,6}} => [2,3,5,6,1,4] => 1

{{1,2,3,5},{4},{6}} => [2,3,5,4,1,6] => 1

{{1,2,3,6},{4,5}} => [2,3,6,5,4,1] => 2

{{1,2,3},{4,5,6}} => [2,3,1,5,6,4] => 2

{{1,2,3},{4,5},{6}} => [2,3,1,5,4,6] => 2

{{1,2,3,6},{4},{5}} => [2,3,6,4,5,1] => 1

{{1,2,3},{4,6},{5}} => [2,3,1,6,5,4] => 2

{{1,2,3},{4},{5,6}} => [2,3,1,4,6,5] => 2

{{1,2,3},{4},{5},{6}} => [2,3,1,4,5,6] => 1

{{1,2,4,5,6},{3}} => [2,4,3,5,6,1] => 1

{{1,2,4,5},{3,6}} => [2,4,6,5,1,3] => 1

{{1,2,4,5},{3},{6}} => [2,4,3,5,1,6] => 1

{{1,2,4,6},{3,5}} => [2,4,5,6,3,1] => 2

{{1,2,4},{3,5,6}} => [2,4,5,1,6,3] => 2

{{1,2,4},{3,5},{6}} => [2,4,5,1,3,6] => 1

{{1,2,4,6},{3},{5}} => [2,4,3,6,5,1] => 1

{{1,2,4},{3,6},{5}} => [2,4,6,1,5,3] => 2

{{1,2,4},{3},{5,6}} => [2,4,3,1,6,5] => 2

{{1,2,4},{3},{5},{6}} => [2,4,3,1,5,6] => 1

{{1,2,5,6},{3,4}} => [2,5,4,3,6,1] => 2

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$F_{1} = 1$

$F_{2} = 1 + q$

$F_{3} = 1 + 4\ q$

$F_{4} = 1 + 12\ q + 2\ q^{2}$

$F_{5} = 1 + 33\ q + 18\ q^{2}$

$F_{6} = 1 + 90\ q + 106\ q^{2} + 6\ q^{3}$

Description

The number of visible descents of a permutation.
A visible descent of a permutation

$\pi$ is a position

$i$ such that

$\pi(i+1) \leq \min(i, \pi(i))$ .

Map

to permutation

Description

Sends the set partition to the permutation obtained by considering the blocks as increasing cycles.