# On Ramsey numbers for paths versus wheels

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## Abstract

For two given graphs $F$ and $H$, the Ramsey number $R(F,H)$ is the smallest positive integer $p$ such that for every graph $G$ on $p$ vertices the following holds: either $G$ contains $F$ as a subgraph or the complement of $G$ contains $H$ as a subgraph. In this paper, we study the Ramsey numbers $R(P_n,W_m)$, where $P_n$ is a path on $n$ vertices and $W_m$ is the graph obtained from a cycle on $m$ vertices by adding a new vertex and edges joining it to all the vertices of the cycle. We present the exact values of $R(P_n,W_m)$ for the following values of $n$ and $m: n=1,2,3$ or 5 and $m \ge 3$; $n=4$ and $m=3,4,5$ or 7; $n\ge 6$ and ($m$ is odd, $3 \le m \le 2n-1$) or ($m$ is even, $4\le m\le n+1$); odd $n\ge 7$ and $m=2n-2$ or $m=2n$ or $m \ge (n-3)^2$; odd $n\ge 9$ and $q\cdot n-2q+1 \le m \le q\cdot n-q+2$ with $3\le q \le n-5$. Moreover, we give nontrivial lower bounds and upper bounds for $R(P_n,W_m)$ for the other values of $m$ and $n$.

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