
The Ramsey number \(R(P_n, K_1 + P_m)\) is determined for various ranges of \(n\) and \(m\), where \(P_n\) is a path with \(n\) vertices, and \(K_1 + P_m\) is the graph obtained from a path \(P_m\) by adding an additional vertex that is adjacent to all of the vertices of the path. For example, it is shown that \(R(P_n, K_1 + P_m) = 2n - 1\) for \(n \geq 4\), \(m\) even, and \(4 \leq m \leq n + 1\). This result follows a previous paper of the authors on \(R(P_n, W_m)\), where \(W_m\) is the wheel with \(m + 1\) vertices. On certain intervals bounds are given of which the following is an example. If \(n \geq 6\) and \(m\) is even with \(n + 2 \leq m \leq \lfloor n/3 \rfloor\), then \(m + \lfloor (3n)/2 \rfloor - 2 \geq R(P_n, K_1 + P_m) \geq 2n - 1\). Many small order Ramsey numbers are determined for the pair \((P_n, K_1 + P_m)\).
paths, Ramsey number, Applied Mathematics, Ramsey theory, Generalized Ramsey theory, kipas, Discrete Mathematics and Combinatorics, Path, Kipas
paths, Ramsey number, Applied Mathematics, Ramsey theory, Generalized Ramsey theory, kipas, Discrete Mathematics and Combinatorics, Path, Kipas
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