Does there exist a graph with the chromatic number greater than $2013$ and all the cycles of length greater than $2013 $ too?
2026-04-23 11:02:07.1776942127
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Does there exist a big graph with that property?
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Yes, for every $k$ and every $l$ there are graphs with chromatic number $>k$ And girth $>l$. This is a well-known theorem, usually proved using "the probabilistic method".
See for example this link
Yes. This can be proved by probabilistic method, which was first introduced by Paul Erdos. See here for example.