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Generalized Ramsey numbers via conflict-free hypergraph matchings
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abstract
Given graphs $G, H$ and an integer $q \ge 2$, the generalized Ramsey number, denoted $r(G,H,q)$, is the minimum number of colours needed to edge-colour $G$ such that every copy of $H$ receives at least $q$ colours. In this paper, we prove that for a fixed integer $k \ge 3$, we have $r(K_n,C_k,3) = n/(k-2)+o(n)$. This generalises work of Joos and Muybayi, who proved $r(K_n,C_4,3) = n/2+o(n)$. We also provide an upper bound on $r(K_{n,n}, C_k, 3)$, which generalises a result of Joos and Mubayi that $r(K_{n,n},C_4,3) = 2n/3+o(n)$. Both of our results are in fact specific cases of more general theorems concerning families of cycles.
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Cited by 1 Pith paper
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Edge-coloring $K_{n, n}$ with no 2-colored $C_{2k}$
The minimum number of colors in a (C_{2k},3)-coloring of K_{n,n} is exactly (7/20)n+o(n) for k=3 and lies between improved explicit bounds for all k≥4.
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