Veröffentlichung

Titel:

Edge-Orders

AutorInnen:

Lena Schlipf
Jens M. Schmidt

Kategorie:

Artikel in Zeitschriften

erschienen in:

Algorithmica, 81(5), Seiten 1881-1900

Abstract:

Canonical orderings and their relatives such as st-numberings have been used as a key tool in algorithmic graph theory for the last decades. Recently, a unifying link behind all these orders has been shown that links them to well-known graph decompositions into parts that have a prescribed vertex-connectivity. Despite extensive interest in canonical orderings, no analogue of this unifying concept is known for edge-connectivity. In this paper, we establish such a concept named edge-orders and show how to compute (1, 1)-edge-orders of 2-edge-connected graphs as well as (2, 1)-edge-orders of 3-edge-connected graphs in linear time, respectively. While the former can be seen as the edge-variants of st-numberings, the latter are the edge-variants of Mondshein sequences and non-separating ear decompositions. The methods that we use for obtaining such edge-orders differ considerably in almost all details from the ones used for their vertex-counterparts, as different graph-theoretic constructions are used in the inductive proof and standard reductions from edge- to vertex-connectivity are bound to fail. As a first application, we consider the famous Edge-Independent Spanning Tree Conjecture, which asserts that every k-edge-connected graph contains k rooted spanning trees that are pairwise edge-independent. We illustrate the impact of the above edge-orders by deducing algorithms that construct 2- and 3-edge independent spanning trees of 2- and 3-edge-connected graphs, the latter of which improves the best known running time from 𝑂(𝑛2) to linear time.

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arXiv

BibTeX-Eintrag:

@article{, author = {Lena Schlipf and Jens. M. Schmidt}, title = {Edge-Orders}, journal = {Algorithmica}, year = {2019}, pages={1881--1900}, volume={81}, number={5}, doi = {http://dx.doi.org/10.1007/s00453-018-0516-4} }