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On the growth rate of chromatic numbers of finite subgraphs

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arxiv 1902.08177 v2 pith:ZCGBBNSW submitted 2019-02-21 math.LO math.CO

classification math.LOmath.CO
keywords chromaticeverymathbbnumberanswersfewerfinitefunction
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abstract

We prove that, for every function $f:\mathbb{N} \rightarrow \mathbb{N}$, there is a graph $G$ with uncountable chromatic number such that, for every $k \in \mathbb{N}$ with $k \geq 3$, every subgraph of $G$ with fewer than $f(k)$ vertices has chromatic number less than $k$. This answers a question of Erd\H{o}s, Hajnal, and Szemeredi.

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  1. On the growth rate of dichromatic numbers of finite subdigraphs

    math.CO 2019-08 conditional novelty 7.0 of 10

    For every growth function f, there are uncountably dichromatic digraphs of size continuum in which every (n+2)-dichromatic finite subdigraph has at least f(n) vertices, and it is consistent with arbitrarily large cont...

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