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On the number of pentagons in triangle-free graphs

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Hatami, Hamed, Hladký, Jan, Králʼ, Daniel, Norine, Serguei and Razborov, Alexander (2013) On the number of pentagons in triangle-free graphs. Journal of Combinatorial Theory, Series A, Volume 120 (Number 3). pp. 722-732. doi:10.1016/j.jcta.2012.12.008 ISSN 0097-3165.

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Official URL: http://dx.doi.org/10.1016/j.jcta.2012.12.008

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Abstract

Using the formalism of flag algebras, we prove that every triangle-free graph G with n vertices contains at most (n/5)(5) cycles of length five. Moreover, the equality is attained only when n is divisible by five and G is the balanced blow-up of the pentagon. We also compute the maximal number of pentagons and characterize extremal graphs in the non-divisible case provided n is sufficiently large. This settles a conjecture made by Erdos in 1984.

Item Type: Journal Article
Subjects: Q Science > QA Mathematics
Divisions: Faculty of Science, Engineering and Medicine > Science > Computer Science
Faculty of Science, Engineering and Medicine > Science > Mathematics
Library of Congress Subject Headings (LCSH): Graph theory
Journal or Publication Title: Journal of Combinatorial Theory, Series A
Publisher: Elsevier BV
ISSN: 0097-3165
Official Date: April 2013
Dates:
DateEvent
April 2013Published
Volume: Volume 120
Number: Number 3
Page Range: pp. 722-732
DOI: 10.1016/j.jcta.2012.12.008
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 25 December 2015
Date of first compliant Open Access: 25 December 2015
Funder: Engineering and Physical Sciences Research Council (EPSRC), European Research Council (ERC), Seventh Framework Programme (European Commission) (FP7), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR), Toyota Kōgyō Daigaku [Toyota Technological Institute]
Grant number: EP/D063191/1 (EPSRC) ; 259385 (ERC)

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