Identifier
-
Mp00128:
Set partitions
—to composition⟶
Integer compositions
Mp00184: Integer compositions —to threshold graph⟶ Graphs
St000455: Graphs ⟶ ℤ
Values
{{1},{2}} => [1,1] => ([(0,1)],2) => -1
{{1,2},{3}} => [2,1] => ([(0,2),(1,2)],3) => 0
{{1,3},{2}} => [2,1] => ([(0,2),(1,2)],3) => 0
{{1},{2,3}} => [1,2] => ([(1,2)],3) => 0
{{1},{2},{3}} => [1,1,1] => ([(0,1),(0,2),(1,2)],3) => -1
{{1,2,3},{4}} => [3,1] => ([(0,3),(1,3),(2,3)],4) => 0
{{1,2,4},{3}} => [3,1] => ([(0,3),(1,3),(2,3)],4) => 0
{{1,2},{3,4}} => [2,2] => ([(1,3),(2,3)],4) => 0
{{1,2},{3},{4}} => [2,1,1] => ([(0,2),(0,3),(1,2),(1,3),(2,3)],4) => 0
{{1,3,4},{2}} => [3,1] => ([(0,3),(1,3),(2,3)],4) => 0
{{1,3},{2,4}} => [2,2] => ([(1,3),(2,3)],4) => 0
{{1,3},{2},{4}} => [2,1,1] => ([(0,2),(0,3),(1,2),(1,3),(2,3)],4) => 0
{{1,4},{2,3}} => [2,2] => ([(1,3),(2,3)],4) => 0
{{1},{2,3,4}} => [1,3] => ([(2,3)],4) => 0
{{1,4},{2},{3}} => [2,1,1] => ([(0,2),(0,3),(1,2),(1,3),(2,3)],4) => 0
{{1},{2},{3,4}} => [1,1,2] => ([(1,2),(1,3),(2,3)],4) => 0
{{1},{2},{3},{4}} => [1,1,1,1] => ([(0,1),(0,2),(0,3),(1,2),(1,3),(2,3)],4) => -1
{{1,2,3,4},{5}} => [4,1] => ([(0,4),(1,4),(2,4),(3,4)],5) => 0
{{1,2,3,5},{4}} => [4,1] => ([(0,4),(1,4),(2,4),(3,4)],5) => 0
{{1,2,3},{4,5}} => [3,2] => ([(1,4),(2,4),(3,4)],5) => 0
{{1,2,3},{4},{5}} => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,2,4,5},{3}} => [4,1] => ([(0,4),(1,4),(2,4),(3,4)],5) => 0
{{1,2,4},{3,5}} => [3,2] => ([(1,4),(2,4),(3,4)],5) => 0
{{1,2,4},{3},{5}} => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,2,5},{3,4}} => [3,2] => ([(1,4),(2,4),(3,4)],5) => 0
{{1,2},{3,4,5}} => [2,3] => ([(2,4),(3,4)],5) => 0
{{1,2,5},{3},{4}} => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,2},{3},{4,5}} => [2,1,2] => ([(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,2},{3},{4},{5}} => [2,1,1,1] => ([(0,2),(0,3),(0,4),(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,3,4,5},{2}} => [4,1] => ([(0,4),(1,4),(2,4),(3,4)],5) => 0
{{1,3,4},{2,5}} => [3,2] => ([(1,4),(2,4),(3,4)],5) => 0
{{1,3,4},{2},{5}} => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,3,5},{2,4}} => [3,2] => ([(1,4),(2,4),(3,4)],5) => 0
{{1,3},{2,4,5}} => [2,3] => ([(2,4),(3,4)],5) => 0
{{1,3,5},{2},{4}} => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,3},{2},{4,5}} => [2,1,2] => ([(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,3},{2},{4},{5}} => [2,1,1,1] => ([(0,2),(0,3),(0,4),(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,4,5},{2,3}} => [3,2] => ([(1,4),(2,4),(3,4)],5) => 0
{{1,4},{2,3,5}} => [2,3] => ([(2,4),(3,4)],5) => 0
{{1,5},{2,3,4}} => [2,3] => ([(2,4),(3,4)],5) => 0
{{1},{2,3,4,5}} => [1,4] => ([(3,4)],5) => 0
{{1,4,5},{2},{3}} => [3,1,1] => ([(0,3),(0,4),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,4},{2},{3,5}} => [2,1,2] => ([(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,4},{2},{3},{5}} => [2,1,1,1] => ([(0,2),(0,3),(0,4),(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1,5},{2},{3,4}} => [2,1,2] => ([(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1},{2},{3,4,5}} => [1,1,3] => ([(2,3),(2,4),(3,4)],5) => 0
{{1,5},{2},{3},{4}} => [2,1,1,1] => ([(0,2),(0,3),(0,4),(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1},{2},{3},{4,5}} => [1,1,1,2] => ([(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)],5) => 0
{{1},{2},{3},{4},{5}} => [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) => -1
{{1,2,3,4,5},{6}} => [5,1] => ([(0,5),(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,3,4,6},{5}} => [5,1] => ([(0,5),(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,3,4},{5,6}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,3,4},{5},{6}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,3,5,6},{4}} => [5,1] => ([(0,5),(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,3,5},{4,6}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,3,5},{4},{6}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,3,6},{4,5}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,3},{4,5,6}} => [3,3] => ([(2,5),(3,5),(4,5)],6) => 0
{{1,2,3,6},{4},{5}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,3},{4},{5,6}} => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,3},{4},{5},{6}} => [3,1,1,1] => ([(0,3),(0,4),(0,5),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,4,5,6},{3}} => [5,1] => ([(0,5),(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,4,5},{3,6}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,4,5},{3},{6}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,4,6},{3,5}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,4},{3,5,6}} => [3,3] => ([(2,5),(3,5),(4,5)],6) => 0
{{1,2,4,6},{3},{5}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,4},{3},{5,6}} => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,4},{3},{5},{6}} => [3,1,1,1] => ([(0,3),(0,4),(0,5),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,5,6},{3,4}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,2,5},{3,4,6}} => [3,3] => ([(2,5),(3,5),(4,5)],6) => 0
{{1,2,6},{3,4,5}} => [3,3] => ([(2,5),(3,5),(4,5)],6) => 0
{{1,2},{3,4,5,6}} => [2,4] => ([(3,5),(4,5)],6) => 0
{{1,2,5,6},{3},{4}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,5},{3},{4,6}} => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,5},{3},{4},{6}} => [3,1,1,1] => ([(0,3),(0,4),(0,5),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,6},{3},{4,5}} => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2},{3},{4,5,6}} => [2,1,3] => ([(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2,6},{3},{4},{5}} => [3,1,1,1] => ([(0,3),(0,4),(0,5),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2},{3},{4},{5,6}} => [2,1,1,2] => ([(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,2},{3},{4},{5},{6}} => [2,1,1,1,1] => ([(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) => 0
{{1,3,4,5,6},{2}} => [5,1] => ([(0,5),(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,3,4,5},{2,6}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,3,4,5},{2},{6}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3,4,6},{2,5}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,3,4},{2,5,6}} => [3,3] => ([(2,5),(3,5),(4,5)],6) => 0
{{1,3,4,6},{2},{5}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3,4},{2},{5,6}} => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3,4},{2},{5},{6}} => [3,1,1,1] => ([(0,3),(0,4),(0,5),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3,5,6},{2,4}} => [4,2] => ([(1,5),(2,5),(3,5),(4,5)],6) => 0
{{1,3,5},{2,4,6}} => [3,3] => ([(2,5),(3,5),(4,5)],6) => 0
{{1,3,6},{2,4,5}} => [3,3] => ([(2,5),(3,5),(4,5)],6) => 0
{{1,3},{2,4,5,6}} => [2,4] => ([(3,5),(4,5)],6) => 0
{{1,3,5,6},{2},{4}} => [4,1,1] => ([(0,4),(0,5),(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3,5},{2},{4,6}} => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3,5},{2},{4},{6}} => [3,1,1,1] => ([(0,3),(0,4),(0,5),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3,6},{2},{4,5}} => [3,1,2] => ([(1,4),(1,5),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3},{2},{4,5,6}} => [2,1,3] => ([(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3,6},{2},{4},{5}} => [3,1,1,1] => ([(0,3),(0,4),(0,5),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3},{2},{4},{5,6}} => [2,1,1,2] => ([(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)],6) => 0
{{1,3},{2},{4},{5},{6}} => [2,1,1,1,1] => ([(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) => 0
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Description
The second largest eigenvalue of a graph if it is integral.
This statistic is undefined if the second largest eigenvalue of the graph is not integral.
Chapter 4 of [1] provides lots of context.
This statistic is undefined if the second largest eigenvalue of the graph is not integral.
Chapter 4 of [1] provides lots of context.
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.
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.
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