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|Abstract:||Gyarfas conjectured in 1985 that for all $k$, $l$, every graph with no clique of size more than $k$ and no odd hole of length more than $l$ has chromatic number bounded by a function of $k$ and $l$. We prove three weaker statements: (1) Every triangle-free graph with sufficiently large chromatic number has an odd hole of length different from five; (2) For all $l$, every triangle-free graph with sufficiently large chromatic number contains either a 5-hole or an odd hole of length more than $l$; (3) For all $k$, $l$, every graph with no clique of size more than $k$ and sufficiently large chromatic number contains either a 5-hole or a hole of length more than $l$.|
|Electronic Publication Date:||27-Jan-2016|
|Citation:||Chudnovsky, Maria, Seymour, Paul, Scott, Alex. (Induced subgraphs of graphs with large chromatic number. II. Three steps towards Gyarfas' conjectures|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||Journal of combinatorial theory. Series B.|
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