Identifier
-
Mp00080:
Set partitions
—to permutation⟶
Permutations
St000019: Permutations ⟶ ℤ
Values
{{1}} => [1] => 0
{{1,2}} => [2,1] => 1
{{1},{2}} => [1,2] => 0
{{1,2,3}} => [2,3,1] => 2
{{1,2},{3}} => [2,1,3] => 1
{{1,3},{2}} => [3,2,1] => 2
{{1},{2,3}} => [1,3,2] => 1
{{1},{2},{3}} => [1,2,3] => 0
{{1,2,3,4}} => [2,3,4,1] => 3
{{1,2,3},{4}} => [2,3,1,4] => 2
{{1,2,4},{3}} => [2,4,3,1] => 3
{{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] => 3
{{1,3},{2,4}} => [3,4,1,2] => 3
{{1,3},{2},{4}} => [3,2,1,4] => 2
{{1,4},{2,3}} => [4,3,2,1] => 3
{{1},{2,3,4}} => [1,3,4,2] => 2
{{1},{2,3},{4}} => [1,3,2,4] => 1
{{1,4},{2},{3}} => [4,2,3,1] => 3
{{1},{2,4},{3}} => [1,4,3,2] => 2
{{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] => 4
{{1,2,3,4},{5}} => [2,3,4,1,5] => 3
{{1,2,3,5},{4}} => [2,3,5,4,1] => 4
{{1,2,3},{4,5}} => [2,3,1,5,4] => 3
{{1,2,3},{4},{5}} => [2,3,1,4,5] => 2
{{1,2,4,5},{3}} => [2,4,3,5,1] => 4
{{1,2,4},{3,5}} => [2,4,5,1,3] => 4
{{1,2,4},{3},{5}} => [2,4,3,1,5] => 3
{{1,2,5},{3,4}} => [2,5,4,3,1] => 4
{{1,2},{3,4,5}} => [2,1,4,5,3] => 3
{{1,2},{3,4},{5}} => [2,1,4,3,5] => 2
{{1,2,5},{3},{4}} => [2,5,3,4,1] => 4
{{1,2},{3,5},{4}} => [2,1,5,4,3] => 3
{{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] => 4
{{1,3,4},{2,5}} => [3,5,4,1,2] => 4
{{1,3,4},{2},{5}} => [3,2,4,1,5] => 3
{{1,3,5},{2,4}} => [3,4,5,2,1] => 4
{{1,3},{2,4,5}} => [3,4,1,5,2] => 4
{{1,3},{2,4},{5}} => [3,4,1,2,5] => 3
{{1,3,5},{2},{4}} => [3,2,5,4,1] => 4
{{1,3},{2,5},{4}} => [3,5,1,4,2] => 4
{{1,3},{2},{4,5}} => [3,2,1,5,4] => 3
{{1,3},{2},{4},{5}} => [3,2,1,4,5] => 2
{{1,4,5},{2,3}} => [4,3,2,5,1] => 4
{{1,4},{2,3,5}} => [4,3,5,1,2] => 4
{{1,4},{2,3},{5}} => [4,3,2,1,5] => 3
{{1,5},{2,3,4}} => [5,3,4,2,1] => 4
{{1},{2,3,4,5}} => [1,3,4,5,2] => 3
{{1},{2,3,4},{5}} => [1,3,4,2,5] => 2
{{1,5},{2,3},{4}} => [5,3,2,4,1] => 4
{{1},{2,3,5},{4}} => [1,3,5,4,2] => 3
{{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] => 4
{{1,4},{2,5},{3}} => [4,5,3,1,2] => 4
{{1,4},{2},{3,5}} => [4,2,5,1,3] => 4
{{1,4},{2},{3},{5}} => [4,2,3,1,5] => 3
{{1,5},{2,4},{3}} => [5,4,3,2,1] => 4
{{1},{2,4,5},{3}} => [1,4,3,5,2] => 3
{{1},{2,4},{3,5}} => [1,4,5,2,3] => 3
{{1},{2,4},{3},{5}} => [1,4,3,2,5] => 2
{{1,5},{2},{3,4}} => [5,2,4,3,1] => 4
{{1},{2,5},{3,4}} => [1,5,4,3,2] => 3
{{1},{2},{3,4,5}} => [1,2,4,5,3] => 2
{{1},{2},{3,4},{5}} => [1,2,4,3,5] => 1
{{1,5},{2},{3},{4}} => [5,2,3,4,1] => 4
{{1},{2,5},{3},{4}} => [1,5,3,4,2] => 3
{{1},{2},{3,5},{4}} => [1,2,5,4,3] => 2
{{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] => 5
{{1,2,3,4,5},{6}} => [2,3,4,5,1,6] => 4
{{1,2,3,4,6},{5}} => [2,3,4,6,5,1] => 5
{{1,2,3,4},{5,6}} => [2,3,4,1,6,5] => 4
{{1,2,3,4},{5},{6}} => [2,3,4,1,5,6] => 3
{{1,2,3,5,6},{4}} => [2,3,5,4,6,1] => 5
{{1,2,3,5},{4,6}} => [2,3,5,6,1,4] => 5
{{1,2,3,5},{4},{6}} => [2,3,5,4,1,6] => 4
{{1,2,3,6},{4,5}} => [2,3,6,5,4,1] => 5
{{1,2,3},{4,5,6}} => [2,3,1,5,6,4] => 4
{{1,2,3},{4,5},{6}} => [2,3,1,5,4,6] => 3
{{1,2,3,6},{4},{5}} => [2,3,6,4,5,1] => 5
{{1,2,3},{4,6},{5}} => [2,3,1,6,5,4] => 4
{{1,2,3},{4},{5,6}} => [2,3,1,4,6,5] => 3
{{1,2,3},{4},{5},{6}} => [2,3,1,4,5,6] => 2
{{1,2,4,5,6},{3}} => [2,4,3,5,6,1] => 5
{{1,2,4,5},{3,6}} => [2,4,6,5,1,3] => 5
{{1,2,4,5},{3},{6}} => [2,4,3,5,1,6] => 4
{{1,2,4,6},{3,5}} => [2,4,5,6,3,1] => 5
{{1,2,4},{3,5,6}} => [2,4,5,1,6,3] => 5
{{1,2,4},{3,5},{6}} => [2,4,5,1,3,6] => 4
{{1,2,4,6},{3},{5}} => [2,4,3,6,5,1] => 5
{{1,2,4},{3,6},{5}} => [2,4,6,1,5,3] => 5
{{1,2,4},{3},{5,6}} => [2,4,3,1,6,5] => 4
{{1,2,4},{3},{5},{6}} => [2,4,3,1,5,6] => 3
{{1,2,5,6},{3,4}} => [2,5,4,3,6,1] => 5
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Description
The cardinality of the support of a permutation.
A permutation $\sigma$ may be written as a product $\sigma = s_{i_1}\dots s_{i_k}$ with $k$ minimal, where $s_i = (i,i+1)$ denotes the simple transposition swapping the entries in positions $i$ and $i+1$.
The set of indices $\{i_1,\dots,i_k\}$ is the support of $\sigma$ and independent of the chosen way to write $\sigma$ as such a product.
See [2], Definition 1 and Proposition 10.
The connectivity set of $\sigma$ of length $n$ is the set of indices $1 \leq i < n$ such that $\sigma(k) < i$ for all $k < i$.
Thus, the connectivity set is the complement of the support.
A permutation $\sigma$ may be written as a product $\sigma = s_{i_1}\dots s_{i_k}$ with $k$ minimal, where $s_i = (i,i+1)$ denotes the simple transposition swapping the entries in positions $i$ and $i+1$.
The set of indices $\{i_1,\dots,i_k\}$ is the support of $\sigma$ and independent of the chosen way to write $\sigma$ as such a product.
See [2], Definition 1 and Proposition 10.
The connectivity set of $\sigma$ of length $n$ is the set of indices $1 \leq i < n$ such that $\sigma(k) < i$ for all $k < i$.
Thus, the connectivity set is the complement of the support.
Map
to permutation
Description
Sends the set partition to the permutation obtained by considering the blocks as increasing cycles.
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