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Ramsey numbers of large even cycles and fans (2210.13998v1)

Published 25 Oct 2022 in math.CO

Abstract: For graphs $F$ and $H$, the Ramsey number $R(F, H)$ is the smallest positive integer $N$ such that any red/blue edge coloring of $K_N$ contains either a red $F$ or a blue $H$. Let $C_n$ be a cycle of length $n$ and $F_n$ be a fan consisting of $n$ triangles all sharing a common vertex. In this paper, we prove that for all sufficiently large $n$, [ R(C_{2\lfloor an\rfloor}, F_n)= \left{ \begin{array}{ll} (2+2a+o(1))n & \textrm{if $1/2\leq a< 1$,}\ (4a+o(1))n & \textrm{if $ a\geq 1$.} \end{array} \right. ]

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