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Oriented Euler complexes and signed perfect matchings

Végh , László A. and von Stengel, Bernhard (2014) Oriented Euler complexes and signed perfect matchings. Mathematical Programming, Online . ISSN 0025-5610 (In Press)

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Abstract

This paper presents “oriented pivoting systems” as an abstract framework for complementary pivoting. It gives a unified simple proof that the endpoints of complementary pivoting paths have opposite sign. A special case are the Nash equilibria of a bimatrix game at the ends of Lemke–Howson paths, which have opposite index. For Euler complexes or “oiks”, an orientation is defined which extends the known concept of oriented abstract simplicial manifolds. Ordered “room partitions” for a family of oriented oiks come in pairs of opposite sign. For an oriented oik of even dimension, this sign property holds also for unordered room partitions. In the case of a two-dimensional oik, these are perfect matchings of an Euler graph, with the sign as defined for Pfaffian orientations of graphs. A near-linear time algorithm is given for the following problem: given a graph with an Eulerian orientation with a perfect matching, find another perfect matching of opposite sign. In contrast, the complementary pivoting algorithm for this problem may be exponential.

Item Type: Article
Official URL: http://link.springer.com/journal/10107
Additional Information: © 2014 Springer, Part of Springer Science+Business Media
Library of Congress subject classification: Q Science > QA Mathematics
Sets: Departments > Mathematics
Departments > Management
Rights: http://www.lse.ac.uk/library/usingTheLibrary/academicSupport/OA/depositYourResearch.aspx
Date Deposited: 14 Apr 2014 13:16
URL: http://eprints.lse.ac.uk/56524/

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