Identifier
-
Mp00068:
Permutations
—Simion-Schmidt map⟶
Permutations
Mp00073: Permutations —major-index to inversion-number bijection⟶ Permutations
Mp00065: Permutations —permutation poset⟶ Posets
St001632: Posets ⟶ ℤ
Values
[1,2] => [1,2] => [1,2] => ([(0,1)],2) => 1
[2,1,3] => [2,1,3] => [2,1,3] => ([(0,2),(1,2)],3) => 1
[3,1,2] => [3,1,2] => [1,3,2] => ([(0,1),(0,2)],3) => 2
[2,3,1,4] => [2,4,1,3] => [1,3,4,2] => ([(0,2),(0,3),(3,1)],4) => 2
[2,4,1,3] => [2,4,1,3] => [1,3,4,2] => ([(0,2),(0,3),(3,1)],4) => 2
[3,2,1,4] => [3,2,1,4] => [3,2,1,4] => ([(0,3),(1,3),(2,3)],4) => 0
[3,4,1,2] => [3,4,1,2] => [1,4,2,3] => ([(0,2),(0,3),(3,1)],4) => 2
[4,2,1,3] => [4,2,1,3] => [3,1,4,2] => ([(0,3),(1,2),(1,3)],4) => 0
[4,3,1,2] => [4,3,1,2] => [1,4,3,2] => ([(0,1),(0,2),(0,3)],4) => 0
[2,3,4,1,5] => [2,5,4,1,3] => [1,4,5,3,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[2,3,5,1,4] => [2,5,4,1,3] => [1,4,5,3,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[2,4,3,1,5] => [2,5,4,1,3] => [1,4,5,3,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[2,4,5,1,3] => [2,5,4,1,3] => [1,4,5,3,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[2,5,3,1,4] => [2,5,4,1,3] => [1,4,5,3,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[2,5,4,1,3] => [2,5,4,1,3] => [1,4,5,3,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[3,2,4,1,5] => [3,2,5,1,4] => [1,4,3,5,2] => ([(0,1),(0,2),(0,3),(2,4),(3,4)],5) => 1
[3,2,5,1,4] => [3,2,5,1,4] => [1,4,3,5,2] => ([(0,1),(0,2),(0,3),(2,4),(3,4)],5) => 1
[3,4,2,1,5] => [3,5,2,1,4] => [4,1,3,5,2] => ([(0,4),(1,2),(1,3),(3,4)],5) => 1
[3,4,5,1,2] => [3,5,4,1,2] => [1,5,3,4,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[3,5,2,1,4] => [3,5,2,1,4] => [4,1,3,5,2] => ([(0,4),(1,2),(1,3),(3,4)],5) => 1
[3,5,4,1,2] => [3,5,4,1,2] => [1,5,3,4,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[4,2,3,1,5] => [4,2,5,1,3] => [1,4,5,2,3] => ([(0,3),(0,4),(3,2),(4,1)],5) => 2
[4,2,5,1,3] => [4,2,5,1,3] => [1,4,5,2,3] => ([(0,3),(0,4),(3,2),(4,1)],5) => 2
[4,3,2,1,5] => [4,3,2,1,5] => [4,3,2,1,5] => ([(0,4),(1,4),(2,4),(3,4)],5) => 0
[4,3,5,1,2] => [4,3,5,1,2] => [1,5,3,2,4] => ([(0,1),(0,2),(0,3),(2,4),(3,4)],5) => 1
[4,5,1,2,3] => [4,5,1,3,2] => [2,5,4,1,3] => ([(0,4),(1,2),(1,3),(1,4)],5) => 0
[4,5,1,3,2] => [4,5,1,3,2] => [2,5,4,1,3] => ([(0,4),(1,2),(1,3),(1,4)],5) => 0
[4,5,2,1,3] => [4,5,2,1,3] => [4,1,5,2,3] => ([(0,4),(1,2),(1,4),(2,3)],5) => 0
[4,5,3,1,2] => [4,5,3,1,2] => [1,5,4,2,3] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
[5,2,3,1,4] => [5,2,4,1,3] => [1,3,5,4,2] => ([(0,3),(0,4),(4,1),(4,2)],5) => 1
[5,2,4,1,3] => [5,2,4,1,3] => [1,3,5,4,2] => ([(0,3),(0,4),(4,1),(4,2)],5) => 1
[5,3,2,1,4] => [5,3,2,1,4] => [4,3,1,5,2] => ([(0,4),(1,4),(2,3),(2,4)],5) => 0
[5,3,4,1,2] => [5,3,4,1,2] => [1,5,2,4,3] => ([(0,3),(0,4),(4,1),(4,2)],5) => 1
[5,4,2,1,3] => [5,4,2,1,3] => [4,1,5,3,2] => ([(0,4),(1,2),(1,3),(1,4)],5) => 0
[5,4,3,1,2] => [5,4,3,1,2] => [1,5,4,3,2] => ([(0,1),(0,2),(0,3),(0,4)],5) => 0
[2,3,4,5,1,6] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,3,4,6,1,5] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,3,5,4,1,6] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,3,5,6,1,4] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,3,6,4,1,5] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,3,6,5,1,4] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,4,3,5,1,6] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,4,3,6,1,5] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,4,5,3,1,6] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,4,5,6,1,3] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,4,6,3,1,5] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,4,6,5,1,3] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,5,3,4,1,6] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,5,3,6,1,4] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,5,4,3,1,6] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,5,4,6,1,3] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,5,6,3,1,4] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,5,6,4,1,3] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,6,3,4,1,5] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,6,3,5,1,4] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,6,4,3,1,5] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,6,4,5,1,3] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,6,5,3,1,4] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[2,6,5,4,1,3] => [2,6,5,4,1,3] => [1,5,6,4,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[3,2,4,5,1,6] => [3,2,6,5,1,4] => [1,5,4,6,3,2] => ([(0,1),(0,2),(0,3),(0,4),(3,5),(4,5)],6) => 0
[3,2,4,6,1,5] => [3,2,6,5,1,4] => [1,5,4,6,3,2] => ([(0,1),(0,2),(0,3),(0,4),(3,5),(4,5)],6) => 0
[3,2,5,4,1,6] => [3,2,6,5,1,4] => [1,5,4,6,3,2] => ([(0,1),(0,2),(0,3),(0,4),(3,5),(4,5)],6) => 0
[3,2,5,6,1,4] => [3,2,6,5,1,4] => [1,5,4,6,3,2] => ([(0,1),(0,2),(0,3),(0,4),(3,5),(4,5)],6) => 0
[3,2,6,4,1,5] => [3,2,6,5,1,4] => [1,5,4,6,3,2] => ([(0,1),(0,2),(0,3),(0,4),(3,5),(4,5)],6) => 0
[3,2,6,5,1,4] => [3,2,6,5,1,4] => [1,5,4,6,3,2] => ([(0,1),(0,2),(0,3),(0,4),(3,5),(4,5)],6) => 0
[3,4,2,5,1,6] => [3,6,2,5,1,4] => [1,3,5,6,4,2] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[3,4,2,6,1,5] => [3,6,2,5,1,4] => [1,3,5,6,4,2] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[3,4,5,2,1,6] => [3,6,5,2,1,4] => [5,1,4,6,3,2] => ([(0,5),(1,2),(1,3),(1,4),(4,5)],6) => 0
[3,4,5,6,1,2] => [3,6,5,4,1,2] => [1,6,4,5,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[3,4,6,2,1,5] => [3,6,5,2,1,4] => [5,1,4,6,3,2] => ([(0,5),(1,2),(1,3),(1,4),(4,5)],6) => 0
[3,4,6,5,1,2] => [3,6,5,4,1,2] => [1,6,4,5,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[3,5,2,4,1,6] => [3,6,2,5,1,4] => [1,3,5,6,4,2] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[3,5,2,6,1,4] => [3,6,2,5,1,4] => [1,3,5,6,4,2] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[3,5,4,2,1,6] => [3,6,5,2,1,4] => [5,1,4,6,3,2] => ([(0,5),(1,2),(1,3),(1,4),(4,5)],6) => 0
[3,5,4,6,1,2] => [3,6,5,4,1,2] => [1,6,4,5,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[3,5,6,2,1,4] => [3,6,5,2,1,4] => [5,1,4,6,3,2] => ([(0,5),(1,2),(1,3),(1,4),(4,5)],6) => 0
[3,5,6,4,1,2] => [3,6,5,4,1,2] => [1,6,4,5,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[3,6,2,4,1,5] => [3,6,2,5,1,4] => [1,3,5,6,4,2] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[3,6,2,5,1,4] => [3,6,2,5,1,4] => [1,3,5,6,4,2] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[3,6,4,2,1,5] => [3,6,5,2,1,4] => [5,1,4,6,3,2] => ([(0,5),(1,2),(1,3),(1,4),(4,5)],6) => 0
[3,6,4,5,1,2] => [3,6,5,4,1,2] => [1,6,4,5,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[3,6,5,2,1,4] => [3,6,5,2,1,4] => [5,1,4,6,3,2] => ([(0,5),(1,2),(1,3),(1,4),(4,5)],6) => 0
[3,6,5,4,1,2] => [3,6,5,4,1,2] => [1,6,4,5,3,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
[4,2,3,5,1,6] => [4,2,6,5,1,3] => [1,5,6,3,4,2] => ([(0,3),(0,4),(0,5),(4,2),(5,1)],6) => 0
[4,2,3,6,1,5] => [4,2,6,5,1,3] => [1,5,6,3,4,2] => ([(0,3),(0,4),(0,5),(4,2),(5,1)],6) => 0
[4,2,5,3,1,6] => [4,2,6,5,1,3] => [1,5,6,3,4,2] => ([(0,3),(0,4),(0,5),(4,2),(5,1)],6) => 0
[4,2,5,6,1,3] => [4,2,6,5,1,3] => [1,5,6,3,4,2] => ([(0,3),(0,4),(0,5),(4,2),(5,1)],6) => 0
[4,2,6,3,1,5] => [4,2,6,5,1,3] => [1,5,6,3,4,2] => ([(0,3),(0,4),(0,5),(4,2),(5,1)],6) => 0
[4,2,6,5,1,3] => [4,2,6,5,1,3] => [1,5,6,3,4,2] => ([(0,3),(0,4),(0,5),(4,2),(5,1)],6) => 0
[4,3,2,5,1,6] => [4,3,2,6,1,5] => [1,5,4,3,6,2] => ([(0,1),(0,2),(0,3),(0,4),(2,5),(3,5),(4,5)],6) => 1
[4,3,2,6,1,5] => [4,3,2,6,1,5] => [1,5,4,3,6,2] => ([(0,1),(0,2),(0,3),(0,4),(2,5),(3,5),(4,5)],6) => 1
[4,3,5,2,1,6] => [4,3,6,2,1,5] => [5,1,4,3,6,2] => ([(0,5),(1,2),(1,3),(1,4),(3,5),(4,5)],6) => 0
[4,3,5,6,1,2] => [4,3,6,5,1,2] => [1,6,4,3,5,2] => ([(0,1),(0,2),(0,3),(0,4),(3,5),(4,5)],6) => 0
[4,3,6,2,1,5] => [4,3,6,2,1,5] => [5,1,4,3,6,2] => ([(0,5),(1,2),(1,3),(1,4),(3,5),(4,5)],6) => 0
[4,3,6,5,1,2] => [4,3,6,5,1,2] => [1,6,4,3,5,2] => ([(0,1),(0,2),(0,3),(0,4),(3,5),(4,5)],6) => 0
[4,5,2,3,1,6] => [4,6,2,5,1,3] => [1,3,6,4,5,2] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[4,5,2,6,1,3] => [4,6,2,5,1,3] => [1,3,6,4,5,2] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[4,5,3,2,1,6] => [4,6,3,2,1,5] => [5,4,1,3,6,2] => ([(0,5),(1,5),(2,3),(2,4),(4,5)],6) => 1
[4,5,3,6,1,2] => [4,6,3,5,1,2] => [1,6,2,4,5,3] => ([(0,3),(0,5),(4,2),(5,1),(5,4)],6) => 1
[4,5,6,2,1,3] => [4,6,5,2,1,3] => [5,1,6,3,4,2] => ([(0,5),(1,3),(1,4),(1,5),(4,2)],6) => 0
[4,5,6,3,1,2] => [4,6,5,3,1,2] => [1,6,5,3,4,2] => ([(0,2),(0,3),(0,4),(0,5),(5,1)],6) => 0
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Description
The number of indecomposable injective modules $I$ with $dim Ext^1(I,A)=1$ for the incidence algebra A of a poset.
Map
Simion-Schmidt map
Description
The Simion-Schmidt map sends any permutation to a $123$-avoiding permutation.
Details can be found in [1].
In particular, this is a bijection between $132$-avoiding permutations and $123$-avoiding permutations, see [1, Proposition 19].
Details can be found in [1].
In particular, this is a bijection between $132$-avoiding permutations and $123$-avoiding permutations, see [1, Proposition 19].
Map
major-index to inversion-number bijection
Description
Return the permutation whose Lehmer code equals the major code of the preimage.
This map sends the major index to the number of inversions.
This map sends the major index to the number of inversions.
Map
permutation poset
Description
Sends a permutation to its permutation poset.
For a permutation $\pi$ of length $n$, this poset has vertices
$$\{ (i,\pi(i))\ :\ 1 \leq i \leq n \}$$
and the cover relation is given by $(w, x) \leq (y, z)$ if $w \leq y$ and $x \leq z$.
For example, the permutation $[3,1,5,4,2]$ is mapped to the poset with cover relations
$$\{ (2, 1) \prec (5, 2),\ (2, 1) \prec (4, 4),\ (2, 1) \prec (3, 5),\ (1, 3) \prec (4, 4),\ (1, 3) \prec (3, 5) \}.$$
For a permutation $\pi$ of length $n$, this poset has vertices
$$\{ (i,\pi(i))\ :\ 1 \leq i \leq n \}$$
and the cover relation is given by $(w, x) \leq (y, z)$ if $w \leq y$ and $x \leq z$.
For example, the permutation $[3,1,5,4,2]$ is mapped to the poset with cover relations
$$\{ (2, 1) \prec (5, 2),\ (2, 1) \prec (4, 4),\ (2, 1) \prec (3, 5),\ (1, 3) \prec (4, 4),\ (1, 3) \prec (3, 5) \}.$$
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