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arXiv · 2611.09347

A Structural Lower Bound for the Ramsey Number of the Petersen Graph

Yuan Si
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Abstract

In this note, we investigate the diagonal Ramsey number of the Petersen graph, denoted by \(R(\mathcal{P}, \mathcal{P})\). To the best of our knowledge, the dynamic survey \textit{Small Ramsey Numbers} (Revision \#18, 2026) records the lower bound as 19, established by Harborth and Krause. We construct a novel 2-coloring on the complete graph \(K_{20}\) that avoids any monochromatic Petersen graph. By defining the blue graph as the complement of the red graph, we utilize a specific join graph structure \(K_{9,9} \vee \overline{K_2}\). We rigorously prove its Petersen-free property, thereby improving the previously documented lower bound to \(R(\mathcal{P}, \mathcal{P}) \ge 21\). Furthermore, we demonstrate the limit of this structural family by showing that the natural extension \(K_{9,9} \vee \overline{K_3}\) contains a Petersen subgraph.

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Yuan Si. 2026-11-06. A Structural Lower Bound for the Ramsey Number of the Petersen Graph. https://arxiv.org/abs/2611.09347

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