Li–Schiermeyer’s star–wheel Ramsey conjecture

From papers

Let R(G,H)R(G,H) denote the Ramsey number of graphs GG and HH, let K1,mK_{1,m} be the star with mm leaves, and let W2nW_{2n} be the wheel on 2n+12n+1 vertices. Li–Schiermeyer’s conjecture. Their formula

R(K1,m,W2n)={2m+n1,m and n are even,2m+n,otherwiseR(K_{1,m}, W_{2n})= \begin{cases} 2m+n-1, & m \text{ and } n \text{ are even},\\ 2m+n, & \text{otherwise} \end{cases}

should hold for all integers m2n14m\geq 2n-1\geq 4. The conjecture would determine the exact star–wheel Ramsey number in the remaining range beyond the results established in the paper.

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Sources & referencesView supporting material

Primary source

Louis DeBiasio and Tucker Wimbish, “On the Ramsey numbers of wheels, cycles, and stars”, arXiv:2604.11937 (2026).

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