A note on monotonicity of mixed Ramsey numbers

Details A note on monotonicity of mixed Ramsey numbers A note on monotonicity of mixed Ramsey numbers

2010-05-14

arxiv.org/abs/1005.2629v1

Mathematics

Combinatorics

4 pages

Scientific paper

For two graphs, $G$, and $H$, an edge-coloring of a complete graph is $(G,H)$-good if there is no monochromatic subgraph isomorphic to $G$ and no rainbow subgraph isomorphic to $H$ in this coloring. The set of number of colors used by some $(G,H)$-colorings of $K_n$ is called a mixed-Ramsey spectrum. This note addresses a fundamental question of whether the spectrum is an interval. It is shown that the answer is "yes" if $G$ is not a star and $H$ does not contain a pendent edge.

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