Identifier
-
Mp00128:
Set partitions
—to composition⟶
Integer compositions
Mp00173: Integer compositions —rotate front to back⟶ Integer compositions
Mp00184: Integer compositions —to threshold graph⟶ Graphs
St000454: Graphs ⟶ ℤ
Values
{{1}} => [1] => [1] => ([],1) => 0
{{1,2}} => [2] => [2] => ([],2) => 0
{{1},{2}} => [1,1] => [1,1] => ([(0,1)],2) => 1
{{1,2,3}} => [3] => [3] => ([],3) => 0
{{1,2},{3}} => [2,1] => [1,2] => ([(1,2)],3) => 1
{{1,3},{2}} => [2,1] => [1,2] => ([(1,2)],3) => 1
{{1},{2},{3}} => [1,1,1] => [1,1,1] => ([(0,1),(0,2),(1,2)],3) => 2
{{1,2,3,4}} => [4] => [4] => ([],4) => 0
{{1,2,3},{4}} => [3,1] => [1,3] => ([(2,3)],4) => 1
{{1,2,4},{3}} => [3,1] => [1,3] => ([(2,3)],4) => 1
{{1,2},{3},{4}} => [2,1,1] => [1,1,2] => ([(1,2),(1,3),(2,3)],4) => 2
{{1,3,4},{2}} => [3,1] => [1,3] => ([(2,3)],4) => 1
{{1,3},{2},{4}} => [2,1,1] => [1,1,2] => ([(1,2),(1,3),(2,3)],4) => 2
{{1,4},{2},{3}} => [2,1,1] => [1,1,2] => ([(1,2),(1,3),(2,3)],4) => 2
{{1},{2},{3},{4}} => [1,1,1,1] => [1,1,1,1] => ([(0,1),(0,2),(0,3),(1,2),(1,3),(2,3)],4) => 3
{{1,2,3,4,5}} => [5] => [5] => ([],5) => 0
{{1,2,3,4},{5}} => [4,1] => [1,4] => ([(3,4)],5) => 1
{{1,2,3,5},{4}} => [4,1] => [1,4] => ([(3,4)],5) => 1
{{1,2,3},{4},{5}} => [3,1,1] => [1,1,3] => ([(2,3),(2,4),(3,4)],5) => 2
{{1,2,4,5},{3}} => [4,1] => [1,4] => ([(3,4)],5) => 1
{{1,2,4},{3},{5}} => [3,1,1] => [1,1,3] => ([(2,3),(2,4),(3,4)],5) => 2
{{1,2,5},{3},{4}} => [3,1,1] => [1,1,3] => ([(2,3),(2,4),(3,4)],5) => 2
{{1,2},{3},{4},{5}} => [2,1,1,1] => [1,1,1,2] => ([(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 3
{{1,3,4,5},{2}} => [4,1] => [1,4] => ([(3,4)],5) => 1
{{1,3,4},{2},{5}} => [3,1,1] => [1,1,3] => ([(2,3),(2,4),(3,4)],5) => 2
{{1,3,5},{2},{4}} => [3,1,1] => [1,1,3] => ([(2,3),(2,4),(3,4)],5) => 2
{{1,3},{2},{4},{5}} => [2,1,1,1] => [1,1,1,2] => ([(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 3
{{1},{2,3,4,5}} => [1,4] => [4,1] => ([(0,4),(1,4),(2,4),(3,4)],5) => 2
{{1},{2,3,4},{5}} => [1,3,1] => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 3
{{1},{2,3,5},{4}} => [1,3,1] => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 3
{{1,4,5},{2},{3}} => [3,1,1] => [1,1,3] => ([(2,3),(2,4),(3,4)],5) => 2
{{1,4},{2},{3},{5}} => [2,1,1,1] => [1,1,1,2] => ([(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 3
{{1},{2,4,5},{3}} => [1,3,1] => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 3
{{1,5},{2},{3},{4}} => [2,1,1,1] => [1,1,1,2] => ([(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 3
{{1},{2},{3},{4},{5}} => [1,1,1,1,1] => [1,1,1,1,1] => ([(0,1),(0,2),(0,3),(0,4),(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 4
{{1,2,3,4,5,6}} => [6] => [6] => ([],6) => 0
{{1,2,3,4,5},{6}} => [5,1] => [1,5] => ([(4,5)],6) => 1
{{1,2,3,4,6},{5}} => [5,1] => [1,5] => ([(4,5)],6) => 1
{{1,2,3,4},{5},{6}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,2,3,5,6},{4}} => [5,1] => [1,5] => ([(4,5)],6) => 1
{{1,2,3,5},{4},{6}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,2,3,6},{4},{5}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,2,3},{4},{5},{6}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,2,4,5,6},{3}} => [5,1] => [1,5] => ([(4,5)],6) => 1
{{1,2,4,5},{3},{6}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,2,4,6},{3},{5}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,2,4},{3},{5},{6}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,2},{3,4,5,6}} => [2,4] => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 2
{{1,2},{3,4,5},{6}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,2},{3,4,6},{5}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,2,5,6},{3},{4}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,2,5},{3},{4},{6}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,2},{3,5,6},{4}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,2,6},{3},{4},{5}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,2},{3},{4},{5},{6}} => [2,1,1,1,1] => [1,1,1,1,2] => ([(1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 4
{{1,3,4,5,6},{2}} => [5,1] => [1,5] => ([(4,5)],6) => 1
{{1,3,4,5},{2},{6}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,3,4,6},{2},{5}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,3,4},{2},{5},{6}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,3},{2,4,5,6}} => [2,4] => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 2
{{1,3},{2,4,5},{6}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,3},{2,4,6},{5}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,3,5,6},{2},{4}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,3,5},{2},{4},{6}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,3},{2,5,6},{4}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,3,6},{2},{4},{5}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,3},{2},{4},{5},{6}} => [2,1,1,1,1] => [1,1,1,1,2] => ([(1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 4
{{1,4},{2,3,5,6}} => [2,4] => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 2
{{1,4},{2,3,5},{6}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,4},{2,3,6},{5}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,5},{2,3,4,6}} => [2,4] => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 2
{{1,5},{2,3,4},{6}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,6},{2,3,4,5}} => [2,4] => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 2
{{1,6},{2,3,4},{5}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,5},{2,3,6},{4}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,6},{2,3,5},{4}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,4,5,6},{2},{3}} => [4,1,1] => [1,1,4] => ([(3,4),(3,5),(4,5)],6) => 2
{{1,4,5},{2},{3},{6}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,4},{2,5,6},{3}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,4,6},{2},{3},{5}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,4},{2},{3},{5},{6}} => [2,1,1,1,1] => [1,1,1,1,2] => ([(1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 4
{{1,5},{2,4,6},{3}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,6},{2,4,5},{3}} => [2,3,1] => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,5,6},{2},{3},{4}} => [3,1,1,1] => [1,1,1,3] => ([(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 3
{{1,5},{2},{3},{4},{6}} => [2,1,1,1,1] => [1,1,1,1,2] => ([(1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 4
{{1,6},{2},{3},{4},{5}} => [2,1,1,1,1] => [1,1,1,1,2] => ([(1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 4
{{1},{2},{3},{4},{5},{6}} => [1,1,1,1,1,1] => [1,1,1,1,1,1] => ([(0,1),(0,2),(0,3),(0,4),(0,5),(1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 5
{{1,2,3,4,5,6,7}} => [7] => [7] => ([],7) => 0
{{1,2,3,4,5,6},{7}} => [6,1] => [1,6] => ([(5,6)],7) => 1
{{1,2,3,4,5,7},{6}} => [6,1] => [1,6] => ([(5,6)],7) => 1
{{1,2,3,4,5},{6},{7}} => [5,1,1] => [1,1,5] => ([(4,5),(4,6),(5,6)],7) => 2
{{1,2,3,4,6,7},{5}} => [6,1] => [1,6] => ([(5,6)],7) => 1
{{1,2,3,4,6},{5},{7}} => [5,1,1] => [1,1,5] => ([(4,5),(4,6),(5,6)],7) => 2
{{1,2,3,4,7},{5},{6}} => [5,1,1] => [1,1,5] => ([(4,5),(4,6),(5,6)],7) => 2
{{1,2,3,4},{5},{6},{7}} => [4,1,1,1] => [1,1,1,4] => ([(3,4),(3,5),(3,6),(4,5),(4,6),(5,6)],7) => 3
{{1,2,3,5,6,7},{4}} => [6,1] => [1,6] => ([(5,6)],7) => 1
{{1,2,3,5,6},{4},{7}} => [5,1,1] => [1,1,5] => ([(4,5),(4,6),(5,6)],7) => 2
{{1,2,3,5,7},{4},{6}} => [5,1,1] => [1,1,5] => ([(4,5),(4,6),(5,6)],7) => 2
{{1,2,3,5},{4},{6},{7}} => [4,1,1,1] => [1,1,1,4] => ([(3,4),(3,5),(3,6),(4,5),(4,6),(5,6)],7) => 3
{{1,2,3},{4,5,6,7}} => [3,4] => [4,3] => ([(2,6),(3,6),(4,6),(5,6)],7) => 2
{{1,2,3},{4,5,6},{7}} => [3,3,1] => [3,1,3] => ([(2,5),(2,6),(3,5),(3,6),(4,5),(4,6),(5,6)],7) => 3
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Description
The largest eigenvalue of a graph if it is integral.
If a graph is $d$-regular, then its largest eigenvalue equals $d$. One can show that the largest eigenvalue always lies between the average degree and the maximal degree.
This statistic is undefined if the largest eigenvalue of the graph is not integral.
If a graph is $d$-regular, then its largest eigenvalue equals $d$. One can show that the largest eigenvalue always lies between the average degree and the maximal degree.
This statistic is undefined if the largest eigenvalue of the graph is not integral.
Map
to composition
Description
The integer composition of block sizes of a set partition.
For a set partition of $\{1,2,\dots,n\}$, this is the integer composition of $n$ obtained by sorting the blocks by their minimal element and then taking the block sizes.
For a set partition of $\{1,2,\dots,n\}$, this is the integer composition of $n$ obtained by sorting the blocks by their minimal element and then taking the block sizes.
Map
rotate front to back
Description
The front to back rotation of the entries of an integer composition.
Map
to threshold graph
Description
The threshold graph corresponding to the composition.
A threshold graph is a graph that can be obtained from the empty graph by adding successively isolated and dominating vertices.
A threshold graph is uniquely determined by its degree sequence.
The Laplacian spectrum of a threshold graph is integral. Interpreting it as an integer partition, it is the conjugate of the partition given by its degree sequence.
A threshold graph is a graph that can be obtained from the empty graph by adding successively isolated and dominating vertices.
A threshold graph is uniquely determined by its degree sequence.
The Laplacian spectrum of a threshold graph is integral. Interpreting it as an integer partition, it is the conjugate of the partition given by its degree sequence.
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