Edge-disjoint paths and cycles in n-edge-connected graphs
β Scribed by Andreas Huck
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 826 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
We consider finite undirected loopless graphs G in which multiple edges are possible. For integers k,l β₯ 0 let g(k, l) be the minimal n β₯ 0 with the following property: If G is an nβedgeβconnected graph, s~1~, β,s~k~, t~1~, β,t~k~ are vertices of G, and f~1~, β,f~l~, g~1~, β,g~l~, are pairwise distinct edges of G, then for each i = 1, β, k there exists a path P~i~ in G, connecting s~i~ and t~i~ and for each i = 1, β,l there exists a cycle C~i~ in G containing f~i~ and g~i~ such that P~1~, β,P~k~, C~1~, β, C~l~ are pairwise edgeβdisjoint. We give upper and lower bounds for g(k, l).
π SIMILAR VOLUMES
A theorem of J. Edmonds states that a directed graph has k edge-disjoint branchings rooted at a vertex r if and only if every vertex has k edge-disjoint paths to r . We conjecture an extension of this theorem to vertex-disjoint paths and give a constructive proof of the conjecture in the case k = 2.
We prove that any k-regular directed graph with no parallel edges contains a collection of at least fl(k2) edge-disjoint cycles; we conjecture that in fact any such graph contains a collection of at least ( lCi1 ) disjoint cycles, and note that this holds for k 5 3. o 1996