Baer invariants of crossed modules
ISSN: 0213-8743
Year of publication: 1991
Volume: 6
Issue: 1
Pages: 35-38
Type: Article
More publications in: Extracta mathematicae
Abstract
The purpose of this paper is to establish a theory of Baer invariants, associated to certain types of varieties of (pre)crossed modules, and to obtain a five term exact sequence and 'the basic theorem' of Stallings in this setting. Our method, which extends results of [4] and aspects of [9], gives a systematic treatment for several cases.