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

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 nn\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(nlnn).\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(nlnn)O(n\ln n) upper bound for every fixed graph FF, the Θ(nlnn)\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.

Sources & referencesView supporting material

Primary source

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

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.