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### Testing expansion in bounded-degree graphs

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Czumaj, Artur and Sohler, Christian
(2010)
*Testing expansion in bounded-degree graphs.*
In: Meeting on Combinatorics and Probability, Mathemat Res Inst, Oberwolfach, Germany, April 26-May 02, 2009. Published in: Combinatorics, Probability and Computing, Vol.19
(No.Special Issue 5-6). pp. 693-709.

**Full text not available from this repository.**

Official URL: http://dx.doi.org/10.1017/S096354831000012X

## Abstract

We consider the problem of testing expansion in hounded-degree graphs. We focus on the notion of vertex expansion: an a-expander is a graph G = (V, E) in which every subset U subset of V of at most vertical bar V vertical bar/2 vertices has a neighbourhood of size at least alpha . vertical bar U vertical bar. Our main result is that one can distinguish good expanders from graphs that are far from being weak expanders in time (O) over tilde(root n). We prove that the property-testing algorithm proposed by Goldreich and Ron with appropriately set parameters accepts every alpha*-expander with probability at least 2/3 and rejects every graph that is epsilon-far from any alpha*-expander with probability at least 2/3, where alpha* = Theta(alpha(2)/d(2) log(n/epsilon)) and d is the maximum degree of the graphs. The algorithm assumes the bounded-degree graphs model with adjacency list graph representation and its running time is O(d(2) root n log (n/epsilon)/alpha(2)epsilon(3)).

Item Type: | Conference Item (UNSPECIFIED) |
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Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software Q Science > QA Mathematics |

Divisions: | Faculty of Science > Computer Science |

Journal or Publication Title: | Combinatorics, Probability and Computing |

Publisher: | Cambridge University Press |

ISSN: | 0963-5483 |

Official Date: | September 2010 |

Volume: | Vol.19 |

Number: | No.Special Issue 5-6 |

Number of Pages: | 17 |

Page Range: | pp. 693-709 |

Identification Number: | 10.1017/S096354831000012X |

Status: | Peer Reviewed |

Publication Status: | Published |

Title of Event: | Meeting on Combinatorics and Probability |

Type of Event: | Conference |

Location of Event: | Mathemat Res Inst, Oberwolfach, Germany |

Date(s) of Event: | April 26-May 02, 2009 |

URI: | http://wrap.warwick.ac.uk/id/eprint/4756 |

Data sourced from Thomson Reuters' Web of Knowledge

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