Baer invariants of crossed modules

Autores: Leoncio Franco Fernández
Localización: Extracta mathematicae, ISSN-e 0213-8743, Vol. 6, Nº 1, 1991, págs. 35-38
Idioma: inglés
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Resumen
- 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.