For a graph G and a digraph h, w e write Gfi (respectively, G 5 2) if every orientation (respectively, acyclic orientation) of the edges of G results in an induced copy of k In this note w e study how small the graphs G such that Gor such that G 5 i/ may be, if k is a given oriented tree ? on n vert
A Ramsey-type result for the hypercube
✍ Scribed by Noga Alon; Radoš Radoičić; Benny Sudakov; Jan Vondrák
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 157 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
✦ Synopsis
We prove that for every fixed k and ≥ 5 and for sufficiently large n, every edge coloring of the hypercube Q n with k colors contains a monochromatic cycle of length 2 . This answers an open question of Chung. Our techniques provide also a characterization of all subgraphs H of the hypercube which are Ramsey, that is, have the property that for every
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