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The size-Ramsey number of powers of paths
Authors:Dennis Clemens  Matthew Jenssen  Yoshiharu Kohayakawa  Natasha Morrison  Guilherme Oliveira Mota  Damian Reding  Barnaby Roberts
Institution:1. Institut für Mathematik, Technische Universität Hamburg, Hamburg, Germany;2. Department of Mathematics, London School of Economics, London, UK;3. Instituto de Matemática e Estatística, Universidade de São Paulo, São Paulo, Brazil;4. Department of Pure Mathematics and Mathematical Statistics, University of Cambridge, Cambridge, UK;5. Centro de Matemática, Computação e Cognição, Universidade Federal do ABC, Santo André, Brazil
Abstract:Given graphs urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0001 and urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0002 and a positive integer urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0003, say that urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0004 is urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0005-Ramsey for urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0006, denoted urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0007, if every urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0008-coloring of the edges of urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0009 contains a monochromatic copy of urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0010. The size-Ramsey number urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0011 of a graph urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0012 is defined to be urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0013. Answering a question of Conlon, we prove that, for every fixed urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0014, we have urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0015, where urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0016 is the urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0017th power of the urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0018-vertex path urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0019 (ie, the graph with vertex set urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0020 and all edges urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0021 such that the distance between urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0022 and urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0023 in urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0024 is at most urn:x-wiley:03649024:media:jgt22432:jgt22432-math-0025). Our proof is probabilistic, but can also be made constructive.
Keywords:powers of paths  Ramsey  size-Ramsey
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