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Does every graph $G$ with chromatic number $\geq \aleph_1$ contain all sufficiently large odd cycles?
#594
:
[ErHa66]
graph theory
,
set theory
A problem of Erdős and Hajnal. This was proved by Erdős, Hajnal, and Shelah
[EHS74]
.
See also
[593]
and
[737]
.
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