Identifier
-
Mp00080:
Set partitions
—to permutation⟶
Permutations
Mp00065: Permutations —permutation poset⟶ Posets
St001301: Posets ⟶ ℤ
Values
{{1}} => [1] => ([],1) => 0
{{1,2}} => [2,1] => ([],2) => 0
{{1},{2}} => [1,2] => ([(0,1)],2) => 0
{{1,2,3}} => [2,3,1] => ([(1,2)],3) => 0
{{1,2},{3}} => [2,1,3] => ([(0,2),(1,2)],3) => 0
{{1,3},{2}} => [3,2,1] => ([],3) => 0
{{1},{2,3}} => [1,3,2] => ([(0,1),(0,2)],3) => 0
{{1},{2},{3}} => [1,2,3] => ([(0,2),(2,1)],3) => 0
{{1,2,3,4}} => [2,3,4,1] => ([(1,2),(2,3)],4) => 0
{{1,2,3},{4}} => [2,3,1,4] => ([(0,3),(1,2),(2,3)],4) => 0
{{1,2,4},{3}} => [2,4,3,1] => ([(1,2),(1,3)],4) => 0
{{1,2},{3,4}} => [2,1,4,3] => ([(0,2),(0,3),(1,2),(1,3)],4) => 1
{{1,2},{3},{4}} => [2,1,3,4] => ([(0,3),(1,3),(3,2)],4) => 0
{{1,3,4},{2}} => [3,2,4,1] => ([(1,3),(2,3)],4) => 0
{{1,3},{2,4}} => [3,4,1,2] => ([(0,3),(1,2)],4) => 0
{{1,3},{2},{4}} => [3,2,1,4] => ([(0,3),(1,3),(2,3)],4) => 0
{{1,4},{2,3}} => [4,3,2,1] => ([],4) => 0
{{1},{2,3,4}} => [1,3,4,2] => ([(0,2),(0,3),(3,1)],4) => 0
{{1},{2,3},{4}} => [1,3,2,4] => ([(0,1),(0,2),(1,3),(2,3)],4) => 0
{{1,4},{2},{3}} => [4,2,3,1] => ([(2,3)],4) => 0
{{1},{2,4},{3}} => [1,4,3,2] => ([(0,1),(0,2),(0,3)],4) => 0
{{1},{2},{3,4}} => [1,2,4,3] => ([(0,3),(3,1),(3,2)],4) => 0
{{1},{2},{3},{4}} => [1,2,3,4] => ([(0,3),(2,1),(3,2)],4) => 0
{{1,2,3,4,5}} => [2,3,4,5,1] => ([(1,4),(3,2),(4,3)],5) => 0
{{1,2,3,4},{5}} => [2,3,4,1,5] => ([(0,4),(1,2),(2,3),(3,4)],5) => 0
{{1,2,3,5},{4}} => [2,3,5,4,1] => ([(1,4),(4,2),(4,3)],5) => 0
{{1,2,3},{4,5}} => [2,3,1,5,4] => ([(0,3),(0,4),(1,2),(2,3),(2,4)],5) => 1
{{1,2,3},{4},{5}} => [2,3,1,4,5] => ([(0,4),(1,2),(2,4),(4,3)],5) => 0
{{1,2,4,5},{3}} => [2,4,3,5,1] => ([(1,2),(1,3),(2,4),(3,4)],5) => 0
{{1,2,4},{3,5}} => [2,4,5,1,3] => ([(0,4),(1,2),(1,4),(2,3)],5) => 0
{{1,2,4},{3},{5}} => [2,4,3,1,5] => ([(0,4),(1,2),(1,3),(2,4),(3,4)],5) => 0
{{1,2,5},{3,4}} => [2,5,4,3,1] => ([(1,2),(1,3),(1,4)],5) => 0
{{1,2},{3,4,5}} => [2,1,4,5,3] => ([(0,3),(0,4),(1,3),(1,4),(4,2)],5) => 1
{{1,2},{3,4},{5}} => [2,1,4,3,5] => ([(0,3),(0,4),(1,3),(1,4),(3,2),(4,2)],5) => 0
{{1,2,5},{3},{4}} => [2,5,3,4,1] => ([(1,3),(1,4),(4,2)],5) => 0
{{1,2},{3,5},{4}} => [2,1,5,4,3] => ([(0,2),(0,3),(0,4),(1,2),(1,3),(1,4)],5) => 2
{{1,2},{3},{4,5}} => [2,1,3,5,4] => ([(0,4),(1,4),(4,2),(4,3)],5) => 0
{{1,2},{3},{4},{5}} => [2,1,3,4,5] => ([(0,4),(1,4),(2,3),(4,2)],5) => 0
{{1,3,4,5},{2}} => [3,2,4,5,1] => ([(1,4),(2,4),(4,3)],5) => 0
{{1,3,4},{2,5}} => [3,5,4,1,2] => ([(0,4),(1,2),(1,3)],5) => 0
{{1,3,4},{2},{5}} => [3,2,4,1,5] => ([(0,4),(1,3),(2,3),(3,4)],5) => 0
{{1,3,5},{2,4}} => [3,4,5,2,1] => ([(2,3),(3,4)],5) => 0
{{1,3},{2,4,5}} => [3,4,1,5,2] => ([(0,3),(1,2),(1,4),(3,4)],5) => 0
{{1,3},{2,4},{5}} => [3,4,1,2,5] => ([(0,3),(1,2),(2,4),(3,4)],5) => 0
{{1,3,5},{2},{4}} => [3,2,5,4,1] => ([(1,3),(1,4),(2,3),(2,4)],5) => 1
{{1,3},{2,5},{4}} => [3,5,1,4,2] => ([(0,3),(0,4),(1,2),(1,4)],5) => 0
{{1,3},{2},{4,5}} => [3,2,1,5,4] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4)],5) => 2
{{1,3},{2},{4},{5}} => [3,2,1,4,5] => ([(0,4),(1,4),(2,4),(4,3)],5) => 0
{{1,4,5},{2,3}} => [4,3,2,5,1] => ([(1,4),(2,4),(3,4)],5) => 0
{{1,4},{2,3,5}} => [4,3,5,1,2] => ([(0,4),(1,4),(2,3)],5) => 0
{{1,4},{2,3},{5}} => [4,3,2,1,5] => ([(0,4),(1,4),(2,4),(3,4)],5) => 0
{{1,5},{2,3,4}} => [5,3,4,2,1] => ([(3,4)],5) => 0
{{1},{2,3,4,5}} => [1,3,4,5,2] => ([(0,2),(0,4),(3,1),(4,3)],5) => 0
{{1},{2,3,4},{5}} => [1,3,4,2,5] => ([(0,2),(0,3),(1,4),(2,4),(3,1)],5) => 0
{{1,5},{2,3},{4}} => [5,3,2,4,1] => ([(2,4),(3,4)],5) => 0
{{1},{2,3,5},{4}} => [1,3,5,4,2] => ([(0,3),(0,4),(4,1),(4,2)],5) => 0
{{1},{2,3},{4,5}} => [1,3,2,5,4] => ([(0,1),(0,2),(1,3),(1,4),(2,3),(2,4)],5) => 0
{{1},{2,3},{4},{5}} => [1,3,2,4,5] => ([(0,2),(0,3),(2,4),(3,4),(4,1)],5) => 0
{{1,4,5},{2},{3}} => [4,2,3,5,1] => ([(1,4),(2,3),(3,4)],5) => 0
{{1,4},{2,5},{3}} => [4,5,3,1,2] => ([(1,4),(2,3)],5) => 0
{{1,4},{2},{3,5}} => [4,2,5,1,3] => ([(0,4),(1,3),(2,3),(2,4)],5) => 0
{{1,4},{2},{3},{5}} => [4,2,3,1,5] => ([(0,4),(1,4),(2,3),(3,4)],5) => 0
{{1,5},{2,4},{3}} => [5,4,3,2,1] => ([],5) => 0
{{1},{2,4,5},{3}} => [1,4,3,5,2] => ([(0,1),(0,2),(0,3),(2,4),(3,4)],5) => 0
{{1},{2,4},{3,5}} => [1,4,5,2,3] => ([(0,3),(0,4),(3,2),(4,1)],5) => 0
{{1},{2,4},{3},{5}} => [1,4,3,2,5] => ([(0,1),(0,2),(0,3),(1,4),(2,4),(3,4)],5) => 0
{{1,5},{2},{3,4}} => [5,2,4,3,1] => ([(2,3),(2,4)],5) => 0
{{1},{2,5},{3,4}} => [1,5,4,3,2] => ([(0,1),(0,2),(0,3),(0,4)],5) => 0
{{1},{2},{3,4,5}} => [1,2,4,5,3] => ([(0,4),(3,2),(4,1),(4,3)],5) => 0
{{1},{2},{3,4},{5}} => [1,2,4,3,5] => ([(0,3),(1,4),(2,4),(3,1),(3,2)],5) => 0
{{1,5},{2},{3},{4}} => [5,2,3,4,1] => ([(2,3),(3,4)],5) => 0
{{1},{2,5},{3},{4}} => [1,5,3,4,2] => ([(0,2),(0,3),(0,4),(4,1)],5) => 0
{{1},{2},{3,5},{4}} => [1,2,5,4,3] => ([(0,4),(4,1),(4,2),(4,3)],5) => 0
{{1},{2},{3},{4,5}} => [1,2,3,5,4] => ([(0,3),(3,4),(4,1),(4,2)],5) => 0
{{1},{2},{3},{4},{5}} => [1,2,3,4,5] => ([(0,4),(2,3),(3,1),(4,2)],5) => 0
{{1,2,3,4,5,6}} => [2,3,4,5,6,1] => ([(1,5),(3,4),(4,2),(5,3)],6) => 0
{{1,2,3,4,5},{6}} => [2,3,4,5,1,6] => ([(0,5),(1,4),(2,5),(3,2),(4,3)],6) => 0
{{1,2,3,4,6},{5}} => [2,3,4,6,5,1] => ([(1,4),(4,5),(5,2),(5,3)],6) => 0
{{1,2,3,4},{5,6}} => [2,3,4,1,6,5] => ([(0,4),(0,5),(1,2),(2,3),(3,4),(3,5)],6) => 1
{{1,2,3,4},{5},{6}} => [2,3,4,1,5,6] => ([(0,5),(1,4),(2,5),(4,2),(5,3)],6) => 0
{{1,2,3,5,6},{4}} => [2,3,5,4,6,1] => ([(1,4),(2,5),(3,5),(4,2),(4,3)],6) => 0
{{1,2,3,5},{4,6}} => [2,3,5,6,1,4] => ([(0,5),(1,4),(3,2),(4,3),(4,5)],6) => 0
{{1,2,3,5},{4},{6}} => [2,3,5,4,1,6] => ([(0,5),(1,4),(2,5),(3,5),(4,2),(4,3)],6) => 0
{{1,2,3,6},{4,5}} => [2,3,6,5,4,1] => ([(1,5),(5,2),(5,3),(5,4)],6) => 0
{{1,2,3},{4,5,6}} => [2,3,1,5,6,4] => ([(0,4),(0,5),(1,3),(3,4),(3,5),(5,2)],6) => 1
{{1,2,3},{4,5},{6}} => [2,3,1,5,4,6] => ([(0,2),(1,4),(1,5),(2,4),(2,5),(4,3),(5,3)],6) => 0
{{1,2,3,6},{4},{5}} => [2,3,6,4,5,1] => ([(1,5),(4,3),(5,2),(5,4)],6) => 0
{{1,2,3},{4,6},{5}} => [2,3,1,6,5,4] => ([(0,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5)],6) => 2
{{1,2,3},{4},{5,6}} => [2,3,1,4,6,5] => ([(0,5),(1,2),(2,5),(5,3),(5,4)],6) => 0
{{1,2,3},{4},{5},{6}} => [2,3,1,4,5,6] => ([(0,5),(1,3),(3,5),(4,2),(5,4)],6) => 0
{{1,2,4,5,6},{3}} => [2,4,3,5,6,1] => ([(1,2),(1,3),(2,5),(3,5),(5,4)],6) => 0
{{1,2,4,5},{3,6}} => [2,4,6,5,1,3] => ([(0,5),(1,4),(1,5),(4,2),(4,3)],6) => 0
{{1,2,4,5},{3},{6}} => [2,4,3,5,1,6] => ([(0,4),(1,2),(1,3),(2,5),(3,5),(5,4)],6) => 0
{{1,2,4,6},{3,5}} => [2,4,5,6,3,1] => ([(1,3),(1,5),(4,2),(5,4)],6) => 0
{{1,2,4},{3,5,6}} => [2,4,5,1,6,3] => ([(0,4),(0,5),(1,2),(1,4),(2,3),(3,5)],6) => 1
{{1,2,4},{3,5},{6}} => [2,4,5,1,3,6] => ([(0,4),(1,2),(1,4),(2,3),(3,5),(4,5)],6) => 0
{{1,2,4,6},{3},{5}} => [2,4,3,6,5,1] => ([(1,2),(1,3),(2,4),(2,5),(3,4),(3,5)],6) => 0
{{1,2,4},{3,6},{5}} => [2,4,6,1,5,3] => ([(0,4),(0,5),(1,2),(1,4),(2,3),(2,5)],6) => 1
{{1,2,4},{3},{5,6}} => [2,4,3,1,6,5] => ([(0,4),(0,5),(1,2),(1,3),(2,4),(2,5),(3,4),(3,5)],6) => 1
{{1,2,4},{3},{5},{6}} => [2,4,3,1,5,6] => ([(0,5),(1,2),(1,3),(2,5),(3,5),(5,4)],6) => 0
{{1,2,5,6},{3,4}} => [2,5,4,3,6,1] => ([(1,2),(1,3),(1,4),(2,5),(3,5),(4,5)],6) => 0
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Description
The first Betti number of the order complex associated with the poset.
The order complex of a poset is the simplicial complex whose faces are the chains of the poset. This statistic is the rank of the first homology group of the order complex.
The order complex of a poset is the simplicial complex whose faces are the chains of the poset. This statistic is the rank of the first homology group of the order complex.
Map
to permutation
Description
Sends the set partition to the permutation obtained by considering the blocks as increasing cycles.
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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