Vertex Ramsey properties of randomly perturbed graphs

30 Sep 2019  ·  Das Shagnik, Morris Patrick, Treglown Andrew ·

Given graphs $F,H$ and $G$, we say that $G$ is $(F,H)_v$-Ramsey if every red/blue vertex colouring of $G$ contains a red copy of $F$ or a blue copy of $H$. Results of {\L}uczak, Ruci\'nski and Voigt and, subsequently, Kreuter determine the threshold for the property that the random graph $G(n,p)$ is $(F,H)_v$-Ramsey... In this paper we consider the sister problem in the setting of randomly perturbed graphs. In particular, we determine how many random edges one needs to add to a dense graph to ensure that with high probability the resulting graph is $(F,H)_v$-Ramsey for all pairs $(F,H)$ that involve at least one clique. read more

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Combinatorics