Higher central extensions and Hopf formulae

@inproceedings{Everaert2009HigherCE,
  title={Higher central extensions and Hopf formulae},
  author={Tomas Everaert},
  year={2009}
}
Higher extensions and higher central extensions, which are of importance to non-abelian homological algebra, are studied, and some fundamental properties are proven. As an application, a direct proof of the invariance of the higher Hopf formulae is obtained. 
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