Reminder: this is today.
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On 2022-04-04 09:45, Mykhaylo Tyomkyn wrote:
Dear all,
This week's speaker is Ben Moore (Charles University). Please find the talk details below.
Best regards, Misha Tyomkyn.
A counterexample to a conjecture of Esperet Benjamin Moore Charles University April 7, 2022, 12:20 in S6
Abstract
I'll show that for any integer n, there exists a K_4-free graph G such that G has chromatic number at least n, and every induced subgraph that is triangle free has chromatic number at most 4. Up to changing this 4 to a 3, this is best possible.
Joint work with Alvaro Carbonero, Patrick Hompe, and Sophie Spirkl.
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