Corrections to “The Ramsey Numbers for a Quadrilateral vs. All Graphs on Six Vertices”

Abstract

The values of the Ramsey numbers $R(C_4,H)$, for any graph $H$ on 6 vertices, are shown in [3]. An erratum is corrected in [4,6], giving $R(C_4,K_{3,3})=11$.

In this paper, we correct three other errata of [3], proving that $R(C_4,K_1+(K_{2,3}–e))=9$, $R(C_4,\overline{K_3\cup P_3})=11$, and $R(C_4,\overline{2P_3})=11$, instead of 10.