Identifier
-
Mp00080:
Set partitions
—to permutation⟶
Permutations
Mp00241: Permutations —invert Laguerre heap⟶ Permutations
Mp00175: Permutations —inverse Foata bijection⟶ Permutations
St000886: Permutations ⟶ ℤ
Values
{{1,2}} => [2,1] => [2,1] => [2,1] => 1
{{1},{2}} => [1,2] => [1,2] => [1,2] => 1
{{1,2,3}} => [2,3,1] => [3,1,2] => [1,3,2] => 1
{{1,2},{3}} => [2,1,3] => [2,1,3] => [2,1,3] => 1
{{1,3},{2}} => [3,2,1] => [3,2,1] => [3,2,1] => 1
{{1},{2,3}} => [1,3,2] => [1,3,2] => [3,1,2] => 2
{{1},{2},{3}} => [1,2,3] => [1,2,3] => [1,2,3] => 1
{{1,2,3,4}} => [2,3,4,1] => [4,1,2,3] => [1,2,4,3] => 1
{{1,2,3},{4}} => [2,3,1,4] => [3,1,2,4] => [1,3,2,4] => 1
{{1,2,4},{3}} => [2,4,3,1] => [4,3,1,2] => [1,4,3,2] => 1
{{1,2},{3,4}} => [2,1,4,3] => [2,1,4,3] => [2,4,1,3] => 2
{{1,2},{3},{4}} => [2,1,3,4] => [2,1,3,4] => [2,1,3,4] => 1
{{1,3,4},{2}} => [3,2,4,1] => [4,1,3,2] => [4,1,3,2] => 2
{{1,3},{2,4}} => [3,4,1,2] => [2,4,1,3] => [4,2,1,3] => 2
{{1,3},{2},{4}} => [3,2,1,4] => [3,2,1,4] => [3,2,1,4] => 1
{{1,4},{2,3}} => [4,3,2,1] => [4,3,2,1] => [4,3,2,1] => 1
{{1},{2,3,4}} => [1,3,4,2] => [1,4,2,3] => [1,4,2,3] => 2
{{1},{2,3},{4}} => [1,3,2,4] => [1,3,2,4] => [3,1,2,4] => 2
{{1,4},{2},{3}} => [4,2,3,1] => [3,1,4,2] => [1,3,4,2] => 2
{{1},{2,4},{3}} => [1,4,3,2] => [1,4,3,2] => [4,3,1,2] => 3
{{1},{2},{3,4}} => [1,2,4,3] => [1,2,4,3] => [4,1,2,3] => 2
{{1},{2},{3},{4}} => [1,2,3,4] => [1,2,3,4] => [1,2,3,4] => 1
{{1,2,3,4,5}} => [2,3,4,5,1] => [5,1,2,3,4] => [1,2,3,5,4] => 1
{{1,2,3,4},{5}} => [2,3,4,1,5] => [4,1,2,3,5] => [1,2,4,3,5] => 1
{{1,2,3,5},{4}} => [2,3,5,4,1] => [5,4,1,2,3] => [1,2,5,4,3] => 1
{{1,2,3},{4,5}} => [2,3,1,5,4] => [3,1,2,5,4] => [1,3,5,2,4] => 2
{{1,2,3},{4},{5}} => [2,3,1,4,5] => [3,1,2,4,5] => [1,3,2,4,5] => 1
{{1,2,4,5},{3}} => [2,4,3,5,1] => [5,1,2,4,3] => [5,1,2,4,3] => 4
{{1,2,4},{3,5}} => [2,4,5,1,3] => [3,5,1,2,4] => [1,5,3,2,4] => 2
{{1,2,4},{3},{5}} => [2,4,3,1,5] => [4,3,1,2,5] => [1,4,3,2,5] => 1
{{1,2,5},{3,4}} => [2,5,4,3,1] => [5,4,3,1,2] => [1,5,4,3,2] => 1
{{1,2},{3,4,5}} => [2,1,4,5,3] => [2,1,5,3,4] => [5,2,1,3,4] => 4
{{1,2},{3,4},{5}} => [2,1,4,3,5] => [2,1,4,3,5] => [2,4,1,3,5] => 2
{{1,2,5},{3},{4}} => [2,5,3,4,1] => [4,1,2,5,3] => [1,2,4,5,3] => 2
{{1,2},{3,5},{4}} => [2,1,5,4,3] => [2,1,5,4,3] => [5,2,4,1,3] => 6
{{1,2},{3},{4,5}} => [2,1,3,5,4] => [2,1,3,5,4] => [2,5,1,3,4] => 2
{{1,2},{3},{4},{5}} => [2,1,3,4,5] => [2,1,3,4,5] => [2,1,3,4,5] => 1
{{1,3,4,5},{2}} => [3,2,4,5,1] => [5,1,3,2,4] => [3,1,2,5,4] => 2
{{1,3,4},{2,5}} => [3,5,4,1,2] => [2,5,4,1,3] => [5,4,2,1,3] => 3
{{1,3,4},{2},{5}} => [3,2,4,1,5] => [4,1,3,2,5] => [4,1,3,2,5] => 2
{{1,3,5},{2,4}} => [3,4,5,2,1] => [5,2,1,3,4] => [2,1,3,5,4] => 1
{{1,3},{2,4,5}} => [3,4,1,5,2] => [5,2,4,1,3] => [5,2,1,4,3] => 2
{{1,3},{2,4},{5}} => [3,4,1,2,5] => [2,4,1,3,5] => [4,2,1,3,5] => 2
{{1,3,5},{2},{4}} => [3,2,5,4,1] => [5,4,1,3,2] => [5,1,4,3,2] => 2
{{1,3},{2,5},{4}} => [3,5,1,4,2] => [4,2,5,1,3] => [2,4,1,5,3] => 2
{{1,3},{2},{4,5}} => [3,2,1,5,4] => [3,2,1,5,4] => [3,2,5,1,4] => 2
{{1,3},{2},{4},{5}} => [3,2,1,4,5] => [3,2,1,4,5] => [3,2,1,4,5] => 1
{{1,4,5},{2,3}} => [4,3,2,5,1] => [5,1,4,3,2] => [5,4,1,3,2] => 3
{{1,4},{2,3,5}} => [4,3,5,1,2] => [2,5,1,4,3] => [2,5,4,1,3] => 2
{{1,4},{2,3},{5}} => [4,3,2,1,5] => [4,3,2,1,5] => [4,3,2,1,5] => 1
{{1,5},{2,3,4}} => [5,3,4,2,1] => [4,2,1,5,3] => [2,1,4,5,3] => 2
{{1},{2,3,4,5}} => [1,3,4,5,2] => [1,5,2,3,4] => [1,2,5,3,4] => 2
{{1},{2,3,4},{5}} => [1,3,4,2,5] => [1,4,2,3,5] => [1,4,2,3,5] => 2
{{1,5},{2,3},{4}} => [5,3,2,4,1] => [4,1,5,3,2] => [4,5,1,3,2] => 2
{{1},{2,3,5},{4}} => [1,3,5,4,2] => [1,5,4,2,3] => [1,5,4,2,3] => 3
{{1},{2,3},{4,5}} => [1,3,2,5,4] => [1,3,2,5,4] => [3,5,1,2,4] => 4
{{1},{2,3},{4},{5}} => [1,3,2,4,5] => [1,3,2,4,5] => [3,1,2,4,5] => 2
{{1,4,5},{2},{3}} => [4,2,3,5,1] => [5,1,3,4,2] => [1,5,3,4,2] => 3
{{1,4},{2,5},{3}} => [4,5,3,1,2] => [2,5,3,1,4] => [2,5,3,1,4] => 4
{{1,4},{2},{3,5}} => [4,2,5,1,3] => [3,5,1,4,2] => [3,5,1,4,2] => 1
{{1,4},{2},{3},{5}} => [4,2,3,1,5] => [3,1,4,2,5] => [1,3,4,2,5] => 2
{{1,5},{2,4},{3}} => [5,4,3,2,1] => [5,4,3,2,1] => [5,4,3,2,1] => 1
{{1},{2,4,5},{3}} => [1,4,3,5,2] => [1,5,2,4,3] => [5,1,4,2,3] => 4
{{1},{2,4},{3,5}} => [1,4,5,2,3] => [1,3,5,2,4] => [5,3,1,2,4] => 4
{{1},{2,4},{3},{5}} => [1,4,3,2,5] => [1,4,3,2,5] => [4,3,1,2,5] => 3
{{1,5},{2},{3,4}} => [5,2,4,3,1] => [4,3,1,5,2] => [1,4,3,5,2] => 2
{{1},{2,5},{3,4}} => [1,5,4,3,2] => [1,5,4,3,2] => [5,4,3,1,2] => 4
{{1},{2},{3,4,5}} => [1,2,4,5,3] => [1,2,5,3,4] => [1,5,2,3,4] => 2
{{1},{2},{3,4},{5}} => [1,2,4,3,5] => [1,2,4,3,5] => [4,1,2,3,5] => 2
{{1,5},{2},{3},{4}} => [5,2,3,4,1] => [4,1,3,5,2] => [4,1,3,5,2] => 4
{{1},{2,5},{3},{4}} => [1,5,3,4,2] => [1,4,2,5,3] => [1,4,5,2,3] => 1
{{1},{2},{3,5},{4}} => [1,2,5,4,3] => [1,2,5,4,3] => [5,4,1,2,3] => 3
{{1},{2},{3},{4,5}} => [1,2,3,5,4] => [1,2,3,5,4] => [5,1,2,3,4] => 4
{{1},{2},{3},{4},{5}} => [1,2,3,4,5] => [1,2,3,4,5] => [1,2,3,4,5] => 1
{{1,2,3,4,5,6}} => [2,3,4,5,6,1] => [6,1,2,3,4,5] => [1,2,3,4,6,5] => 1
{{1,2,3,4,5},{6}} => [2,3,4,5,1,6] => [5,1,2,3,4,6] => [1,2,3,5,4,6] => 1
{{1,2,3,4,6},{5}} => [2,3,4,6,5,1] => [6,5,1,2,3,4] => [1,2,3,6,5,4] => 1
{{1,2,3,4},{5,6}} => [2,3,4,1,6,5] => [4,1,2,3,6,5] => [1,2,4,6,3,5] => 2
{{1,2,3,4},{5},{6}} => [2,3,4,1,5,6] => [4,1,2,3,5,6] => [1,2,4,3,5,6] => 1
{{1,2,3,5,6},{4}} => [2,3,5,4,6,1] => [6,1,2,3,5,4] => [6,1,2,3,5,4] => 2
{{1,2,3,5},{4,6}} => [2,3,5,6,1,4] => [4,6,1,2,3,5] => [1,2,6,4,3,5] => 2
{{1,2,3,5},{4},{6}} => [2,3,5,4,1,6] => [5,4,1,2,3,6] => [1,2,5,4,3,6] => 1
{{1,2,3,6},{4,5}} => [2,3,6,5,4,1] => [6,5,4,1,2,3] => [1,2,6,5,4,3] => 1
{{1,2,3},{4,5,6}} => [2,3,1,5,6,4] => [3,1,2,6,4,5] => [3,1,6,2,4,5] => 2
{{1,2,3},{4,5},{6}} => [2,3,1,5,4,6] => [3,1,2,5,4,6] => [1,3,5,2,4,6] => 2
{{1,2,3,6},{4},{5}} => [2,3,6,4,5,1] => [5,1,2,3,6,4] => [1,2,3,5,6,4] => 2
{{1,2,3},{4,6},{5}} => [2,3,1,6,5,4] => [3,1,2,6,5,4] => [6,1,3,5,2,4] => 8
{{1,2,3},{4},{5,6}} => [2,3,1,4,6,5] => [3,1,2,4,6,5] => [1,3,6,2,4,5] => 2
{{1,2,3},{4},{5},{6}} => [2,3,1,4,5,6] => [3,1,2,4,5,6] => [1,3,2,4,5,6] => 1
{{1,2,4,5,6},{3}} => [2,4,3,5,6,1] => [6,1,2,4,3,5] => [4,1,2,3,6,5] => 2
{{1,2,4,5},{3,6}} => [2,4,6,5,1,3] => [3,6,5,1,2,4] => [1,6,5,3,2,4] => 3
{{1,2,4,5},{3},{6}} => [2,4,3,5,1,6] => [5,1,2,4,3,6] => [5,1,2,4,3,6] => 4
{{1,2,4,6},{3,5}} => [2,4,5,6,3,1] => [6,3,1,2,4,5] => [1,3,2,4,6,5] => 1
{{1,2,4},{3,5,6}} => [2,4,5,1,6,3] => [6,3,5,1,2,4] => [1,6,3,2,5,4] => 2
{{1,2,4},{3,5},{6}} => [2,4,5,1,3,6] => [3,5,1,2,4,6] => [1,5,3,2,4,6] => 2
{{1,2,4,6},{3},{5}} => [2,4,3,6,5,1] => [6,5,1,2,4,3] => [6,1,2,5,4,3] => 4
{{1,2,4},{3,6},{5}} => [2,4,6,1,5,3] => [5,3,6,1,2,4] => [3,1,5,2,6,4] => 2
{{1,2,4},{3},{5,6}} => [2,4,3,1,6,5] => [4,3,1,2,6,5] => [1,4,3,6,2,5] => 2
{{1,2,4},{3},{5},{6}} => [2,4,3,1,5,6] => [4,3,1,2,5,6] => [1,4,3,2,5,6] => 1
{{1,2,5,6},{3,4}} => [2,5,4,3,6,1] => [6,1,2,5,4,3] => [6,5,1,2,4,3] => 7
{{1,2,5},{3,4,6}} => [2,5,4,6,1,3] => [3,6,1,2,5,4] => [1,3,6,5,2,4] => 2
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Description
The number of permutations with the same antidiagonal sums.
The X-ray of a permutation $\pi$ is the vector of the sums of the antidiagonals of the permutation matrix of $\pi$, read from left to right. For example, the permutation matrix of $\pi=[3,1,2,5,4]$ is
$$\left(\begin{array}{rrrrr} 0 & 1 & 0 & 0 & 0 \\ 0 & 0 & 1 & 0 & 0 \\ 1 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 & 1 \\ 0 & 0 & 0 & 1 & 0 \end{array}\right),$$
so its X-ray is $(0, 1, 1, 1, 0, 0, 0, 2, 0)$.
This statistic records the number of permutations having the same X-ray as the given permutation. In [1] this is called the degeneracy of the X-ray of the permutation.
By [prop.1, 1], the number of different X-rays of permutations of size $n$ equals the number of nondecreasing differences of permutations of size $n$, [2].
The X-ray of a permutation $\pi$ is the vector of the sums of the antidiagonals of the permutation matrix of $\pi$, read from left to right. For example, the permutation matrix of $\pi=[3,1,2,5,4]$ is
$$\left(\begin{array}{rrrrr} 0 & 1 & 0 & 0 & 0 \\ 0 & 0 & 1 & 0 & 0 \\ 1 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 & 1 \\ 0 & 0 & 0 & 1 & 0 \end{array}\right),$$
so its X-ray is $(0, 1, 1, 1, 0, 0, 0, 2, 0)$.
This statistic records the number of permutations having the same X-ray as the given permutation. In [1] this is called the degeneracy of the X-ray of the permutation.
By [prop.1, 1], the number of different X-rays of permutations of size $n$ equals the number of nondecreasing differences of permutations of size $n$, [2].
Map
to permutation
Description
Sends the set partition to the permutation obtained by considering the blocks as increasing cycles.
Map
inverse Foata bijection
Description
The inverse of Foata's bijection.
See Mp00067Foata bijection.
See Mp00067Foata bijection.
Map
invert Laguerre heap
Description
The permutation obtained by inverting the corresponding Laguerre heap, according to Viennot.
Let $\pi$ be a permutation. Following Viennot [1], we associate to $\pi$ a heap of pieces, by considering each decreasing run $(\pi_i, \pi_{i+1}, \dots, \pi_j)$ of $\pi$ as one piece, beginning with the left most run. Two pieces commute if and only if the minimal element of one piece is larger than the maximal element of the other piece.
This map yields the permutation corresponding to the heap obtained by reversing the reading direction of the heap.
Equivalently, this is the permutation obtained by flipping the noncrossing arc diagram of Reading [2] vertically.
By definition, this map preserves the set of decreasing runs.
Let $\pi$ be a permutation. Following Viennot [1], we associate to $\pi$ a heap of pieces, by considering each decreasing run $(\pi_i, \pi_{i+1}, \dots, \pi_j)$ of $\pi$ as one piece, beginning with the left most run. Two pieces commute if and only if the minimal element of one piece is larger than the maximal element of the other piece.
This map yields the permutation corresponding to the heap obtained by reversing the reading direction of the heap.
Equivalently, this is the permutation obtained by flipping the noncrossing arc diagram of Reading [2] vertically.
By definition, this map preserves the set of decreasing runs.
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