A new approach to van Kampen lemma

  • Carmelo Vaccaro
  • Published 2008


Given a group presentation, we show that its relators can be obtained as outputs of a certain family of algorithms. We introduce an application going from the set of these algorithms to the natural numbers and we show that the area of a relator (and therefore the Dehn function of the presentation) can be defined by means of this application. This permits to… (More)


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