Böttcher, Julia, Taraz, Anusch and Würfl, Andreas
(2012)
*Perfect graphs of fixed density: counting and homogeneous sets.*
Combinatorics, Probability and Computing, 21
(5).
pp. 661-682.
ISSN 0963-5483

## Abstract

For c ∈ (0,1) let C n(c) denote the set of C n-vertex perfect graphs with density c and let C n(c) denote the set of n-vertex graphs without induced C 5 and with density c. We show that lim n→∞ log 2 |Pmathcal;n(c)|/(n 2) = lim n→∞ log 2|C n(c)|/(n 2 = h(c) with h(c) = 1/2 if 1/4 ≤ c ≤ 3/4 and h(c) = 1/2H(|2c - 1|)otherwise, where H is the binary entropy function. Further, we use this result to deduce that almost all graphs in n(c) have homogeneous sets of linear size. This answers a question raised by Loebl and co-workers.

Item Type: | Article |
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Official URL: | http://journals.cambridge.org/action/displayJourna... |

Additional Information: | © 2012 Cambridge University Press |

Library of Congress subject classification: | Q Science > QA Mathematics |

Sets: | Departments > Mathematics |

Rights: | http://www.lse.ac.uk/library/usingTheLibrary/academicSupport/OA/depositYourResearch.aspx |

Date Deposited: | 23 Aug 2012 08:53 |

URL: | http://eprints.lse.ac.uk/45495/ |

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