Making Kr+1-free graphs r-partite

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2021-07
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Balogh, József
Clemen, Felix Christian
Lavrov, Mikhail
Pfender, Florian
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Cambridge University Press
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The Erdős–Simonovits stability theorem states that for all ε > 0 there exists α > 0 such that if G is a Kr+1-free graph on n vertices with e(G) > ex(n, Kr+1)– α n2, then one can remove εn2 edges from G to obtain an r-partite graph. Füredi gave a short proof that one can choose α = ε. We give a bound for the relationship of α and ε which is asymptotically sharp as ε → 0.
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Making Kr+1-Free Graphs r-partite
( 2019-09-30) Balogh, József ; Clemen, Felix Christian ; Lidicky, Bernard ; Lavrov, Mikhail ; Pfender, Florian ; Department of Mathematics

The Erdos-Simonovits stability theorem states that for all epsilon > 0 there exists alpha > 0 such that if G is a Kr+1-free graph on n vertices with e(G) > ex(n, Kr+1)-alpha n2, then one can remove epsilon n2 edges from G to obtain an r-partite graph. Furedi gave a short proof that one can choose alpha = epsilon. We give a bound for the relationship of alpha and epsilon which is asymptotically sharp as epsilon right arrow 0.

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This article is published as Balogh J, Clemen FC, Lavrov M, Lidický B, Pfender F. Making Kr+1-free graphs r-partite. Combinatorics, Probability and Computing. 2021;30(4):609-618. doi:10.1017/S0963548320000590.
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© The Author(s), 2020. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
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