Identifier
-
Mp00080:
Set partitions
—to permutation⟶
Permutations
Mp00090: Permutations —cycle-as-one-line notation⟶ Permutations
Mp00160: Permutations —graph of inversions⟶ Graphs
St000422: Graphs ⟶ ℤ
Values
{{1}} => [1] => [1] => ([],1) => 0
{{1,2}} => [2,1] => [1,2] => ([],2) => 0
{{1},{2}} => [1,2] => [1,2] => ([],2) => 0
{{1,2,3}} => [2,3,1] => [1,2,3] => ([],3) => 0
{{1,2},{3}} => [2,1,3] => [1,2,3] => ([],3) => 0
{{1,3},{2}} => [3,2,1] => [1,3,2] => ([(1,2)],3) => 2
{{1},{2,3}} => [1,3,2] => [1,2,3] => ([],3) => 0
{{1},{2},{3}} => [1,2,3] => [1,2,3] => ([],3) => 0
{{1,2,3,4}} => [2,3,4,1] => [1,2,3,4] => ([],4) => 0
{{1,2,3},{4}} => [2,3,1,4] => [1,2,3,4] => ([],4) => 0
{{1,2,4},{3}} => [2,4,3,1] => [1,2,4,3] => ([(2,3)],4) => 2
{{1,2},{3,4}} => [2,1,4,3] => [1,2,3,4] => ([],4) => 0
{{1,2},{3},{4}} => [2,1,3,4] => [1,2,3,4] => ([],4) => 0
{{1,3},{2,4}} => [3,4,1,2] => [1,3,2,4] => ([(2,3)],4) => 2
{{1,3},{2},{4}} => [3,2,1,4] => [1,3,2,4] => ([(2,3)],4) => 2
{{1},{2,3,4}} => [1,3,4,2] => [1,2,3,4] => ([],4) => 0
{{1},{2,3},{4}} => [1,3,2,4] => [1,2,3,4] => ([],4) => 0
{{1},{2,4},{3}} => [1,4,3,2] => [1,2,4,3] => ([(2,3)],4) => 2
{{1},{2},{3,4}} => [1,2,4,3] => [1,2,3,4] => ([],4) => 0
{{1},{2},{3},{4}} => [1,2,3,4] => [1,2,3,4] => ([],4) => 0
{{1,2,3,4,5}} => [2,3,4,5,1] => [1,2,3,4,5] => ([],5) => 0
{{1,2,3,4},{5}} => [2,3,4,1,5] => [1,2,3,4,5] => ([],5) => 0
{{1,2,3,5},{4}} => [2,3,5,4,1] => [1,2,3,5,4] => ([(3,4)],5) => 2
{{1,2,3},{4,5}} => [2,3,1,5,4] => [1,2,3,4,5] => ([],5) => 0
{{1,2,3},{4},{5}} => [2,3,1,4,5] => [1,2,3,4,5] => ([],5) => 0
{{1,2,4},{3,5}} => [2,4,5,1,3] => [1,2,4,3,5] => ([(3,4)],5) => 2
{{1,2,4},{3},{5}} => [2,4,3,1,5] => [1,2,4,3,5] => ([(3,4)],5) => 2
{{1,2},{3,4,5}} => [2,1,4,5,3] => [1,2,3,4,5] => ([],5) => 0
{{1,2},{3,4},{5}} => [2,1,4,3,5] => [1,2,3,4,5] => ([],5) => 0
{{1,2},{3,5},{4}} => [2,1,5,4,3] => [1,2,3,5,4] => ([(3,4)],5) => 2
{{1,2},{3},{4,5}} => [2,1,3,5,4] => [1,2,3,4,5] => ([],5) => 0
{{1,2},{3},{4},{5}} => [2,1,3,4,5] => [1,2,3,4,5] => ([],5) => 0
{{1,3},{2,4,5}} => [3,4,1,5,2] => [1,3,2,4,5] => ([(3,4)],5) => 2
{{1,3},{2,4},{5}} => [3,4,1,2,5] => [1,3,2,4,5] => ([(3,4)],5) => 2
{{1,3},{2,5},{4}} => [3,5,1,4,2] => [1,3,2,5,4] => ([(1,4),(2,3)],5) => 4
{{1,3},{2},{4,5}} => [3,2,1,5,4] => [1,3,2,4,5] => ([(3,4)],5) => 2
{{1,3},{2},{4},{5}} => [3,2,1,4,5] => [1,3,2,4,5] => ([(3,4)],5) => 2
{{1,4,5},{2,3}} => [4,3,2,5,1] => [1,4,5,2,3] => ([(1,3),(1,4),(2,3),(2,4)],5) => 4
{{1},{2,3,4,5}} => [1,3,4,5,2] => [1,2,3,4,5] => ([],5) => 0
{{1},{2,3,4},{5}} => [1,3,4,2,5] => [1,2,3,4,5] => ([],5) => 0
{{1},{2,3,5},{4}} => [1,3,5,4,2] => [1,2,3,5,4] => ([(3,4)],5) => 2
{{1},{2,3},{4,5}} => [1,3,2,5,4] => [1,2,3,4,5] => ([],5) => 0
{{1},{2,3},{4},{5}} => [1,3,2,4,5] => [1,2,3,4,5] => ([],5) => 0
{{1,4,5},{2},{3}} => [4,2,3,5,1] => [1,4,5,2,3] => ([(1,3),(1,4),(2,3),(2,4)],5) => 4
{{1},{2,4},{3,5}} => [1,4,5,2,3] => [1,2,4,3,5] => ([(3,4)],5) => 2
{{1},{2,4},{3},{5}} => [1,4,3,2,5] => [1,2,4,3,5] => ([(3,4)],5) => 2
{{1},{2},{3,4,5}} => [1,2,4,5,3] => [1,2,3,4,5] => ([],5) => 0
{{1},{2},{3,4},{5}} => [1,2,4,3,5] => [1,2,3,4,5] => ([],5) => 0
{{1},{2},{3,5},{4}} => [1,2,5,4,3] => [1,2,3,5,4] => ([(3,4)],5) => 2
{{1},{2},{3},{4,5}} => [1,2,3,5,4] => [1,2,3,4,5] => ([],5) => 0
{{1},{2},{3},{4},{5}} => [1,2,3,4,5] => [1,2,3,4,5] => ([],5) => 0
{{1,2,3,4,5,6}} => [2,3,4,5,6,1] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,3,4,5},{6}} => [2,3,4,5,1,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,3,4,6},{5}} => [2,3,4,6,5,1] => [1,2,3,4,6,5] => ([(4,5)],6) => 2
{{1,2,3,4},{5,6}} => [2,3,4,1,6,5] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,3,4},{5},{6}} => [2,3,4,1,5,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,3,5},{4,6}} => [2,3,5,6,1,4] => [1,2,3,5,4,6] => ([(4,5)],6) => 2
{{1,2,3,5},{4},{6}} => [2,3,5,4,1,6] => [1,2,3,5,4,6] => ([(4,5)],6) => 2
{{1,2,3},{4,5,6}} => [2,3,1,5,6,4] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,3},{4,5},{6}} => [2,3,1,5,4,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,3},{4,6},{5}} => [2,3,1,6,5,4] => [1,2,3,4,6,5] => ([(4,5)],6) => 2
{{1,2,3},{4},{5,6}} => [2,3,1,4,6,5] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,3},{4},{5},{6}} => [2,3,1,4,5,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,4},{3,5,6}} => [2,4,5,1,6,3] => [1,2,4,3,5,6] => ([(4,5)],6) => 2
{{1,2,4},{3,5},{6}} => [2,4,5,1,3,6] => [1,2,4,3,5,6] => ([(4,5)],6) => 2
{{1,2,4},{3,6},{5}} => [2,4,6,1,5,3] => [1,2,4,3,6,5] => ([(2,5),(3,4)],6) => 4
{{1,2,4},{3},{5,6}} => [2,4,3,1,6,5] => [1,2,4,3,5,6] => ([(4,5)],6) => 2
{{1,2,4},{3},{5},{6}} => [2,4,3,1,5,6] => [1,2,4,3,5,6] => ([(4,5)],6) => 2
{{1,2,5,6},{3,4}} => [2,5,4,3,6,1] => [1,2,5,6,3,4] => ([(2,4),(2,5),(3,4),(3,5)],6) => 4
{{1,2},{3,4,5,6}} => [2,1,4,5,6,3] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2},{3,4,5},{6}} => [2,1,4,5,3,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2},{3,4,6},{5}} => [2,1,4,6,5,3] => [1,2,3,4,6,5] => ([(4,5)],6) => 2
{{1,2},{3,4},{5,6}} => [2,1,4,3,6,5] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2},{3,4},{5},{6}} => [2,1,4,3,5,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2,5,6},{3},{4}} => [2,5,3,4,6,1] => [1,2,5,6,3,4] => ([(2,4),(2,5),(3,4),(3,5)],6) => 4
{{1,2},{3,5},{4,6}} => [2,1,5,6,3,4] => [1,2,3,5,4,6] => ([(4,5)],6) => 2
{{1,2},{3,5},{4},{6}} => [2,1,5,4,3,6] => [1,2,3,5,4,6] => ([(4,5)],6) => 2
{{1,2},{3},{4,5,6}} => [2,1,3,5,6,4] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2},{3},{4,5},{6}} => [2,1,3,5,4,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2},{3},{4,6},{5}} => [2,1,3,6,5,4] => [1,2,3,4,6,5] => ([(4,5)],6) => 2
{{1,2},{3},{4},{5,6}} => [2,1,3,4,6,5] => [1,2,3,4,5,6] => ([],6) => 0
{{1,2},{3},{4},{5},{6}} => [2,1,3,4,5,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,3,4,5,6},{2}} => [3,2,4,5,6,1] => [1,3,4,5,6,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 4
{{1,3},{2,4,5,6}} => [3,4,1,5,6,2] => [1,3,2,4,5,6] => ([(4,5)],6) => 2
{{1,3},{2,4,5},{6}} => [3,4,1,5,2,6] => [1,3,2,4,5,6] => ([(4,5)],6) => 2
{{1,3},{2,4,6},{5}} => [3,4,1,6,5,2] => [1,3,2,4,6,5] => ([(2,5),(3,4)],6) => 4
{{1,3},{2,4},{5,6}} => [3,4,1,2,6,5] => [1,3,2,4,5,6] => ([(4,5)],6) => 2
{{1,3},{2,4},{5},{6}} => [3,4,1,2,5,6] => [1,3,2,4,5,6] => ([(4,5)],6) => 2
{{1,3},{2,5},{4,6}} => [3,5,1,6,2,4] => [1,3,2,5,4,6] => ([(2,5),(3,4)],6) => 4
{{1,3},{2,5},{4},{6}} => [3,5,1,4,2,6] => [1,3,2,5,4,6] => ([(2,5),(3,4)],6) => 4
{{1,3},{2},{4,5,6}} => [3,2,1,5,6,4] => [1,3,2,4,5,6] => ([(4,5)],6) => 2
{{1,3},{2},{4,5},{6}} => [3,2,1,5,4,6] => [1,3,2,4,5,6] => ([(4,5)],6) => 2
{{1,3},{2},{4,6},{5}} => [3,2,1,6,5,4] => [1,3,2,4,6,5] => ([(2,5),(3,4)],6) => 4
{{1,3},{2},{4},{5,6}} => [3,2,1,4,6,5] => [1,3,2,4,5,6] => ([(4,5)],6) => 2
{{1,3},{2},{4},{5},{6}} => [3,2,1,4,5,6] => [1,3,2,4,5,6] => ([(4,5)],6) => 2
{{1,4,5},{2,3,6}} => [4,3,6,5,1,2] => [1,4,5,2,3,6] => ([(2,4),(2,5),(3,4),(3,5)],6) => 4
{{1,4,5},{2,3},{6}} => [4,3,2,5,1,6] => [1,4,5,2,3,6] => ([(2,4),(2,5),(3,4),(3,5)],6) => 4
{{1,6},{2,3,4,5}} => [6,3,4,5,2,1] => [1,6,2,3,4,5] => ([(1,5),(2,5),(3,5),(4,5)],6) => 4
{{1},{2,3,4,5,6}} => [1,3,4,5,6,2] => [1,2,3,4,5,6] => ([],6) => 0
{{1},{2,3,4,5},{6}} => [1,3,4,5,2,6] => [1,2,3,4,5,6] => ([],6) => 0
{{1,6},{2,3,4},{5}} => [6,3,4,2,5,1] => [1,6,2,3,4,5] => ([(1,5),(2,5),(3,5),(4,5)],6) => 4
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Description
The energy of a graph, if it is integral.
The energy of a graph is the sum of the absolute values of its eigenvalues. This statistic is only defined for graphs with integral energy. It is known, that the energy is never an odd integer [2]. In fact, it is never the square root of an odd integer [3].
The energy of a graph is the sum of the energies of the connected components of a graph. The energy of the complete graph $K_n$ equals $2n-2$. For this reason, we do not define the energy of the empty graph.
The energy of a graph is the sum of the absolute values of its eigenvalues. This statistic is only defined for graphs with integral energy. It is known, that the energy is never an odd integer [2]. In fact, it is never the square root of an odd integer [3].
The energy of a graph is the sum of the energies of the connected components of a graph. The energy of the complete graph $K_n$ equals $2n-2$. For this reason, we do not define the energy of the empty graph.
Map
graph of inversions
Description
The graph of inversions of a permutation.
For a permutation of $\{1,\dots,n\}$, this is the graph with vertices $\{1,\dots,n\}$, where $(i,j)$ is an edge if and only if it is an inversion of the permutation.
For a permutation of $\{1,\dots,n\}$, this is the graph with vertices $\{1,\dots,n\}$, where $(i,j)$ is an edge if and only if it is an inversion of the permutation.
Map
cycle-as-one-line notation
Description
Return the permutation obtained by concatenating the cycles of a permutation, each written with minimal element first, sorted by minimal element.
Map
to permutation
Description
Sends the set partition to the permutation obtained by considering the blocks as increasing cycles.
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