Geodesic
Natural central extensions of groups
Christian Liedtke1
1Universität Bonn, Germany
Groups, geometry, and dynamics, Tome 2 (2008) no. 2, pp. 245-261

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DOI

Given a group G and an integer n≥2, we construct a new group K~(G,n). Although this construction naturally occurs in the context of finding new invariants for complex algebraic surfaces, it is related to the theory of central extensions and the Schur multiplier. A surprising application is that Abelian groups of odd order possess naturally defined covers that can be computed from a given cover by a kind of warped Baer sum.
DOI : 10.4171/ggd/38
Classification : 20-XX, 00-XX
Mots-clés : Covering groups, Schur multiplier, fundamental groups of plane curve complements

Christian Liedtke  1

1 Universität Bonn, Germany 
Christian Liedtke. Natural central extensions of groups. Groups, geometry, and dynamics, Tome 2 (2008) no. 2, pp. 245-261. doi: 10.4171/ggd/38
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