CONSTRUCTION OF AN INFINITELY GENERATED GROUP THAT IS NOT A FREE PRODUCT OF SURFACE GROUPS AND ABELIAN-GROUPS, BUT WHICH ACTS FREELY ON AN R-TREE

Authors
Citation
A. Zastrow, CONSTRUCTION OF AN INFINITELY GENERATED GROUP THAT IS NOT A FREE PRODUCT OF SURFACE GROUPS AND ABELIAN-GROUPS, BUT WHICH ACTS FREELY ON AN R-TREE, Proceedings of the Royal Society of Edinburgh. Section A. Mathematics, 128, 1998, pp. 433-445
Citations number
17
Categorie Soggetti
Mathematics,Mathematics,Mathematics,Mathematics
ISSN journal
03082105
Volume
128
Year of publication
1998
Part
2
Pages
433 - 445
Database
ISI
SICI code
0308-2105(1998)128:<433:COAIGG>2.0.ZU;2-X
Abstract
The existence of a group H as described in the title shows that the st atement of Rips's Theorem for finitely generated groups cannot be exte nded without further complications to infinitely generated groups. The construction as given in this paper uses a careful combinatorial desc ription of the fundamental group of the Hawaiian Earrings and a length function that can be put on a special subgroup. Then the existence of H follows using a theorem of Chiswell, Alperin and Moss.