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What and Who
Title:A Quasi-Polynomial Time Partition Oracle for Graphs with an Excluded Minor
Speaker:Reut Levi
coming from:Université Paris Diderot - Paris 7 and École Normale Supérieure, France.
Speakers Bio:
Event Type:AG1 Mittagsseminar (own work)
Visibility:D1, D2, D3, D4, D5, SWS, RG1, MMCI
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Level:AG Audience
Language:English
Date, Time and Location
Date:Monday, 9 March 2015
Time:11:00
Duration:30 Minutes
Location:Saarbrücken
Building:E1 4
Room:024
Abstract
Motivated by the problem of testing planarity and related properties, we study the problem of designing efficient {\em partition oracles\/}.

A {\em partition oracle\/} is a procedure that, given access to the incidence lists representation of a bounded-degree graph $G= (V,E)$ and a parameter $\eps$, when queried on a vertex $v\in V$, returns the part (subset of vertices) which $v$ belongs to in a partition of all graph vertices. The partition should be such that all parts are small, each part is connected, and if the graph has certain properties, the total number of edges between parts is at most $\eps |V|$.
In this work we give a partition oracle for graphs with excluded minors whose query complexity is quasi-polynomial in $1/\eps$, thus improving on the result of Hassidim et al. ({\em Proceedings of FOCS 2009}) who gave a partition oracle with query complexity exponential in $1/\eps$. This improvement implies corresponding improvements in the complexity of testing planarity and other properties that are characterized by excluded minors as well as sublinear-time approximation algorithms that work under the promise that the graph has an excluded minor.

Contact
Name(s):Christina Fries
Video Broadcast
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Created by:Christina Fries/AG1/MPII/DE, 02/23/2015 12:02 PMLast modified by:Uwe Brahm/MPII/DE, 11/24/2016 04:13 PM
  • Christina Fries, 02/26/2015 01:56 PM
  • Christina Fries, 02/23/2015 12:08 PM -- Created document.