Finite graphs of groups with isomorphic fundamental groups

1991 ◽  
Vol 30 (5) ◽  
pp. 389-409 ◽  
Author(s):  
D. G. Khramtsov
Keyword(s):  
Fundamental Groups ◽  
Finite Graphs ◽  
Graphs Of Groups

scholarly journals FOLDINGS, GRAPHS OF GROUPS AND THE MEMBERSHIP PROBLEM

2005 ◽  
Vol 15 (01) ◽  
pp. 95-128 ◽  
Author(s):  
ILYA KAPOVICH ◽  
RICHARD WEIDMANN ◽  
ALEXEI MYASNIKOV
Keyword(s):  
Solvable Groups ◽  
Fundamental Groups ◽  
Membership Problem ◽  
Artin Groups ◽  
Graphs Of Groups ◽  
Uniform Subgroup ◽  
Right Angled Artin Groups ◽  
Subgroup Membership Problem

We introduce a combinatorial version of Stallings–Bestvina–Feighn–Dunwoody folding sequences. We then show how they are useful in analyzing the solvability of the uniform subgroup membership problem for fundamental groups of graphs of groups. Applications include coherent right-angled Artin groups and coherent solvable groups.

Weak potency of certain fundamental groups of graphs of groups

2017 ◽  
Author(s):  
Muhammad Sufi ◽  
Kok Bin Wong ◽  
Peng Choon Wong
Keyword(s):  
Fundamental Groups ◽  
Graphs Of Groups

scholarly journals Folding-like techniques for CAT(0) cube complexes

2021 ◽  
pp. 1-12
Author(s):  
MICHAEL BEN–ZVI ◽  
ROBERT KROPHOLLER ◽  
RYLEE ALANZA LYMAN
Keyword(s):  
Free Group ◽  
Finite Rank ◽  
Coxeter Groups ◽  
Free Groups ◽  
Fundamental Groups ◽  
Finitely Generated ◽  
Seminal Paper ◽  
Finite Graphs ◽  
Cube Complexes ◽  
Positively Curved

Abstract In a seminal paper, Stallings introduced folding of morphisms of graphs. One consequence of folding is the representation of finitely-generated subgroups of a finite-rank free group as immersions of finite graphs. Stallings’s methods allow one to construct this representation algorithmically, giving effective, algorithmic answers and proofs to classical questions about subgroups of free groups. Recently Dani–Levcovitz used Stallings-like methods to study subgroups of right-angled Coxeter groups, which act geometrically on CAT(0) cube complexes. In this paper we extend their techniques to fundamental groups of non-positively curved cube complexes.

scholarly journals $C^*$-algebras associated with the fundamental groups of graphs of groups

2005 ◽  
Vol 97 (1) ◽  
pp. 49 ◽  
Author(s):  
Rui Okayasu
Keyword(s):  
Fundamental Group ◽  
Hyperbolic Group ◽  
Fundamental Groups ◽  
Graph Of Groups ◽  
C Algebra ◽  
C Algebras ◽  
Graphs Of Groups ◽  
Word Hyperbolic Group ◽  
Dimensional Boundary ◽  
The Ideal

We construct a nuclear $C^*$-algebra associated with the fundamental group of a graph of groups of finite type. It is well-known that every word-hyperbolic group with zero-dimensional boundary, in other words, every group acting trees with finite stabilizers is given by the fundamental group of such a graph of groups. We show that our $C^*$-algebra is $*$-isomorphic to the crossed product arising from the associated boundary action and is also given by a Cuntz-Pimsner algebra. We also compute the K-groups and determine the ideal structures of our $C^*$-algebras.

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