The triangle-edge dichotomy conjecture for saturation numbers in random graphs

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Let G(n,p)G(n,p) be the binomial random graph, let FF be a graph, and let sat⁡(G,F)\operatorname{sat}(G,F) denote the minimum number of edges in an inclusion-maximal FF-free subgraph of GG. Here, whp\textbf{whp} means with high probability as n→∞n\to\infty.

Triangle-edge dichotomy conjecture. Let 0<p<10<p<1 be a constant. If every edge of FF belongs to a triangle in FF, then, with high probability,

sat⁡(G(n,p),F)=Θ(nln⁡n).\operatorname{sat}(G(n,p),F)=\Theta(n\ln n).

If some edge of FF does not belong to a triangle in FF, then, with high probability,

sat⁡(G(n,p),F)=O(n).\operatorname{sat}(G(n,p),F)=O(n).

The paper proves the O(nln⁡n)O(n\ln n) upper bound for every fixed graph FF, the Θ(nln⁡n)\Theta(n\ln n) order when every edge of FF belongs to a triangle, and the O(n)O(n) bound for a large family including all bipartite graphs. The conjecture asserts that these two structural conditions completely determine the asymptotic order.

References

Primary source

Sahar Diskin, Ilay Hoshen and Maksim Zhukovskii, “A Jump of the Saturation Number in Random Graphs?”, arXiv:2303.12046 (2024).

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