Word calculus in the fundamental group of the Menger curve

Hanspeter Fischer , Andreas Zastrow


The fundamental group of the Menger universal curve is uncountable and not free, although all of its finitely generated subgroups are free. It contains an isomorphic copy of the fundamental group of every one-dimensional separable metric space and an isomorphic copy of the fundamental group of every planar Peano continuum. We give an explicit and systematic combinatorial description of the fundamental group of the Menger universal curve and its generalized Cayley graph in terms of word sequences. The word calculus, which requires only two letters and their inverses, is based on Pasynkov’s partial topological product representation and can be expressed in terms of a variation on the classical puzzle known as the Towers of Hanoi.
Author Hanspeter Fischer
Hanspeter Fischer,,
, Andreas Zastrow (FMPI / IM)
Andreas Zastrow,,
- Institute of Mathematics
Journal seriesFundamenta Mathematicae, ISSN 0016-2736, (A 25 pkt)
Issue year2016
Publication size in sheets1.35
ASJC Classification2602 Algebra and Number Theory
URL https://www.impan.pl/pl/wydawnictwa/czasopisma-i-serie-wydawnicze/fundamenta-mathematicae/all/235
Languageen angielski
Score (nominal)25
ScoreMinisterial score = 20.0, 24-07-2019, ArticleFromJournal
Ministerial score (2013-2016) = 25.0, 24-07-2019, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.06; WoS Impact Factor: 2016 = 0.609 (2) - 2016=0.529 (5)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.