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A Relaxed Version of the Erdős–Lovász Tihany Conjecture
Authors:Michael Stiebitz
Affiliation:INSTITUTE OF MATHEMATICS, TECHNISCHE UNIVERSIT?T ILMENAU, ILMENAU, GERMANY
Abstract:The Erd?s–Lovász Tihany conjecture asserts that every graph G with urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0001 urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0002) contains two vertex disjoint subgraphs G 1 and G 2 such that urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0003 and urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0004. Under the same assumption on G , we show that there are two vertex disjoint subgraphs G 1 and G 2 of G such that (a) urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0005 and urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0006 or (b) urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0007 and urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0008. Here, urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0009 is the chromatic number of urn:x-wiley:03649024:media:jgt22060:jgt22060-math-0010 is the clique number of G , and col(G ) is the coloring number of G .
Keywords:coloring  decomposition  double‐critical graphs
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