Abstract
For a finitely generated group Γ denote by µ(Γ) the growth coefficient of Γ, that is, the infimum over all real numbers d such that s n (Γ) < n!d. We show that the growth coefficient of a virtually free group is always rational, and that every rational number occurs as growth coefficient of some virtually free group.
Similar content being viewed by others
References
The GAP Group, GAP-Groups, Algorithms, and Programming, Version 4.4; 2006. http://www.gap-system.org
B. Huppert, Endliche Gruppen, Springer-Verlag, Berlin-Heidelberg-New York, 1967.
A. Maróti, On the orders of primitive groups, Journal of Algebra 258 (2002), 631–640.
T. W. Müller, Combinatorial aspects of finitely generated virtually free groups, Journal of the London Mathematical Society (2) 44 (1991), 75–94.
T. W. Müller, Subgroup growth of free products, Inventiones Mathematicae 126 (1996), 111–131.
T. W. Müller and J.-C. Schlage-Puchta, Character theory of symmetric groups, subgroup growth of Fuchsian groups, and random walks, Advances in Mathematics 213 (2007), 919–982.
T. W. Müller and J.-C. Schlage-Puchta, Decomposition of the conjugacy representation of the symmetric group, and subgroup growth, submitted.
T. W. Müller and J.-C. Schlage-Puchta, Some examples in the theory of subgroup growth, Monatshefte für Mathematik 146 (2005), 49–76.
T. W. Müller and J.-C. Schlage-Puchta, Some probabilistic subgruops of a finitely generated group, in preparation.
J.-P. Serre, Trees, Springer-Verlag, Berlin-New York, 1980.
C. C. Sims, Primitive groups, graphs and block designs, Annals of the New York Academy of Sciences 175 (1970), 351–353.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Schlage-Puchta, JC. The subgroup growth spectrum of virtually free groups. Isr. J. Math. 177, 229–251 (2010). https://doi.org/10.1007/s11856-010-0044-7
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11856-010-0044-7