The topology at infinity of Out(Fn)

Mladen Bestvina, Mark Feighn

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


We construct a bordification of Outer Space analogous to the Borel-Serre bordification of symmetric spaces. As an application, we show that Out(Fn) is (2n - 5)-connected at infinity and that it is a virtual duality group of dimension 2n - 3.

Original languageEnglish (US)
Pages (from-to)651-692
Number of pages42
JournalInventiones Mathematicae
Issue number3
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • General Mathematics


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