Homology, Homotopy and Applications
Volume 4 (2002)
Some results on central extensions of crossed modules
Pages: 29 – 42
In this paper certain central extensions of crossed modules are classified. For these extensions, we obtain several results which extend the classical ones for central extensions of groups. In particular, central stem extensions of a perfect crossed module are classified in terms of a second integral homology crossed module.
crossed module, central extension, stem extension
2010 Mathematics Subject Classification
18G50, 18Gxx, 20Jxx