Packing odd $T$-joins with at most two terminals
Abstract
Take a graph , an edge subset , and a set of terminals where is even. The triple is called a signed graft. A -join is odd if it contains an odd number of edges from . Let be the maximum number of edge-disjoint odd -joins. A signature is a set of the form where and is even. Let be the minimum cardinality a -cut or a signature can achieve. Then and we say that packs if equality holds here. We prove that packs if the signed graft is Eulerian and it excludes two special non-packing minors. Our result confirms the Cycling Conjecture for the class of clutters of odd -joins with at most two terminals. Corollaries of this result include, the characterizations of weakly and evenly bipartite graphs, packing two-commodity paths, packing -joins with at most four terminals, and a new result on covering edges with cuts.
Keywords
Cite
@article{arxiv.1410.7423,
title = {Packing odd $T$-joins with at most two terminals},
author = {Ahmad Abdi and Bertrand Guenin},
journal= {arXiv preprint arXiv:1410.7423},
year = {2018}
}
Comments
extended abstract appeared in IPCO 2014 (under the different title "the cycling property for the clutter of odd st-walks")