The random-graph conjecture for external and internal bisections

For a graph on nn vertices, a bisection is a red-blue colouring in which the colour-class sizes are equal, or differ by one when nn is odd. An external bisection has at least half of every vertex's neighbours in the opposite colour, while an internal bisection has at least half in its own colour. Let pn[0,1]p_n\in[0,1] be allowed to depend on nn, and let GG(n,pn)G\sim\mathbb{G}(n,p_n) be the Erdős–Rényi random graph. Random-graph bisection conjecture. For any pn[0,1]p_n\in[0,1], with high probability GG has an external bisection. If (1pn)nlogn(1-p_n)n-\log n\to\infty, then with high probability GG also has an internal bisection. The external assertion is stated for all edge probabilities, while the internal assertion excludes the regime in which the graph is too close to complete; the source records this conjecture as open.

Sources & referencesView supporting material

Primary source

Michael Anastos, Oliver Cooley, Mihyun Kang and Matthew Kwan, “Partitioning problems via random processes”, arXiv:2307.06453 (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.