TY - JOUR

T1 - Packing edge-disjoint odd Eulerian subgraphs through prescribed vertices in 4-edge-connected graphs

AU - Kakimura, Naonori

AU - Kawarabayashi, Ken Ichi

AU - Kobayashi, Yusuke

N1 - Funding Information:
This work is supported by JST, ERATO, the Kawarabayashi Large Graph Project, and KAKENHI grants JP24106002, JP24106003, JP24700004, and JP25730001.
Publisher Copyright:
© 2017 Society for Industrial and Applied Mathematics.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2017

Y1 - 2017

N2 - In this paper, we show the Erdos-Pósa property for edge-disjoint packing of S-closed walks with parity constraints in 4-edge-connected graphs. More precisely, we prove that for any 4-edge-connected graph G and any vertex subset S, either G has k edge-disjoint elementary closed odd walks, each of which has at least one vertex of S, or G has an edge set F with |F| ≥ f(k) such that G - F has no such walks. The 4-edge-connectivity is the best possible in the sense that 3-edge-connected graphs do not satisfy the statement. Since the proof is constructive, we can design a fixed-parameter algorithm for finding k edge-disjoint walks satisfying the conditions in a 4-edge-connected graph for a parameter k. In addition, this gives a simple fixed-parameter algorithm for the parity edge-disjoint walks problem with k terminal pairs.

AB - In this paper, we show the Erdos-Pósa property for edge-disjoint packing of S-closed walks with parity constraints in 4-edge-connected graphs. More precisely, we prove that for any 4-edge-connected graph G and any vertex subset S, either G has k edge-disjoint elementary closed odd walks, each of which has at least one vertex of S, or G has an edge set F with |F| ≥ f(k) such that G - F has no such walks. The 4-edge-connectivity is the best possible in the sense that 3-edge-connected graphs do not satisfy the statement. Since the proof is constructive, we can design a fixed-parameter algorithm for finding k edge-disjoint walks satisfying the conditions in a 4-edge-connected graph for a parameter k. In addition, this gives a simple fixed-parameter algorithm for the parity edge-disjoint walks problem with k terminal pairs.

KW - Cycle packing

KW - Erdos-Pósa property

KW - Fixed-parameter algorithm

UR - http://www.scopus.com/inward/record.url?scp=85021888664&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85021888664&partnerID=8YFLogxK

U2 - 10.1137/15M1022239

DO - 10.1137/15M1022239

M3 - Article

AN - SCOPUS:85021888664

SN - 0895-4801

VL - 31

SP - 766

EP - 782

JO - SIAM Journal on Discrete Mathematics

JF - SIAM Journal on Discrete Mathematics

IS - 2

ER -