Skip to main content
SpringerLink
Log in

On the number of subgroups of given index inSL 2(Z)

  • Published:
Archiv der Mathematik Aims and scope Submit manuscript

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

References

  1. I. M. S.Dey, Schreier systems in free products. Ph. D. Thesis, Manchester 1963.

  2. I. M. S. Dey, Schreier systems in free products. Proc. Glasgow Math. Assoc.7, 61–79 (1965).

    Google Scholar 

  3. M. Hall, Jr., Subgroups of finite index in free groups. Canad. J. Math.1, 187–190 (1949).

    Google Scholar 

  4. W. Imrich, Subgroup theorems and graphs. In: Combinatorial Mathematics V, Lect. Notes Math.622, 1–27 (1977).

    Google Scholar 

  5. L. Moser andM. Wyman, Asymptotic expansions. Canad. J. Math.8, 225–233 (1956).

    Google Scholar 

  6. M. Newman, Asymptotic formulas related to free products of cyclic groups. Math. Comp.30, 838–846 (1976).

    Google Scholar 

  7. W. W. Stothers, The number of subgroups of given index in the modular group. Proc. Royal Soc. Edinburgh78 A, 105–112 (1977).

    Google Scholar 

  8. K. Wohlfahrt, Über einen Satz von Dey und die Modulgruppe. Arch. Math.29, 455–457 (1977).

    Google Scholar 

  9. E. M. Wright, A relationship between two sequences. Proc. London Math. Soc.17, 296–304 (1967).

    Google Scholar 

Download references

Author information

Author notes

  1. Wilfried Imrich

    Present address: Institut für Angewandte Mathematik, Montanuniversität Leoben, A-8700, Leoben, Österreich

Authors and Affiliations

    Authors
    1. Wilfried Imrich
      View author publications

      You can also search for this author in PubMed Google Scholar

    Rights and permissions

    Reprints and permissions

    About this article

    Cite this article

    Imrich, W. On the number of subgroups of given index inSL 2(Z). Arch. Math 31, 224–231 (1978). https://doi.org/10.1007/BF01226441

    Download citation

    • Received:

    • Issue Date:

    • DOI: https://doi.org/10.1007/BF01226441

    Search

    Navigation