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Sidorenko Incidence Graph


SidorenkoIncidenceGraph

The name "Sidorenko incidence graph" is used in this work for the 35-vertex, 66-edge Levi graph constructed below. The graph is shown above in a planar embedding and a bipartite graph drawing.

Take the 13 points 0, 1, ..., 12 and the following 22 triples as disjoint vertex classes:

 T={(0,1,3),(0,1,9),(0,2,3),(0,2,9),(1,3,10),(1,7,10),(1,7,12),(1,9,12),(2,3,4),(2,4,9),(3,4,11),(3,10,11),(4,8,9),(4,8,11),(5,6,7),(5,6,11),(5,7,10),(5,10,11),(6,7,12),(6,8,11),(6,8,12),(8,9,12)}.

Join a point to a triple iff the point belongs to that triple. The resulting bipartite graph is connected and has a trivial group as its graph automorphism group. Each triple-vertex has vertex degree 3; the point-vertices have degrees 4, 5, and 6 with multiplicities 3, 6, and 4, respectively.


See also

Bipartite Graph, Graph Automorphism Group, Graph Homomorphism Density, Levi Graph, Sidorenko's Conjecture, Sidorenko Graph

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References

House of Graphs. "Part of a counterexample to Sidorenko's conjecture." https://houseofgraphs.org/graphs/58033.

Cite this as:

Weisstein, Eric W. "Sidorenko Incidence Graph." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SidorenkoIncidenceGraph.html

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