Highly parity linked graphs

  • Authors:
  • Ken-Ichi Kawarabayashi;Bruce Reed

  • Affiliations:
  • Tohoku University, Graduate School of Information Sciences (GSIS), Aramaki aza Aoba 09 Aoba-ku Sendai, 980-8579, Miyagi, Japan;McGill University, School of Computer Science, 3480 University, H3A 2A7, Montreal, Quebec, Canada

  • Venue:
  • Combinatorica
  • Year:
  • 2009

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Abstract

A graph G is k-linked if G has at least 2k vertices, and for any 2k vertices x 1,x 2, …, x k ,y 1,y 2, …, y k , G contains k pairwise disjoint paths P 1, …, P k such that P i joins x i and y i for i = 1,2, …, k. We say that G is parity-k-linked if G is k-linked and, in addition, the paths P 1, …, P k can be chosen such that the parities of their length are prescribed. Thomassen [22] was the first to prove the existence of a function f(k) such that every f(k)-connected graph is parity-k-linked if the deletion of any 4k-3 vertices leaves a nonbipartite graph. In this paper, we will show that the above statement is still valid for 50k-connected graphs. This is the first result that connectivity which is a linear function of k guarantees the Erdős-Pósa type result for parity-k-linked graphs.