Spherical diagrams and labelled oriented trees

Günther Huck, Stephan Rosebrock

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

To prove that certain standard 2-complexes are aspherical we explore a strategy that combines a well-known method based on a graph theoretic lemma of Stallings with a process of reversing the orientation of edges in spherical diagrams. We apply this strategy to labelled-oriented-tree complexes and, more generally, to labelled-oriented-graph (LOG) complexes and obtain classes of aspherical LOG complexes to which, traditionally (without the reversing of edges), Stallings's lemma could not be applied to prove asphericity. These classes contain examples whose asphericity, as far as we know, could not be established by any previous method.

Original languageEnglish (US)
Pages (from-to)519-530
Number of pages12
JournalProceedings of the Royal Society of Edinburgh Section A: Mathematics
Volume137
Issue number3
DOIs
StatePublished - Aug 2 2007

ASJC Scopus subject areas

  • Mathematics(all)

Fingerprint Dive into the research topics of 'Spherical diagrams and labelled oriented trees'. Together they form a unique fingerprint.

  • Cite this