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Annali di Matematica Pura ed Applicata

, Volume 65, Issue 1, pp 27–33 | Cite as

On a problem of G. Sansone

  • Morris Newman
Article

Summary

It is proved that the members of a certain family of free subgroups of index 6n in the modular group Γ are congruence groups if and only if n=1, 2, 4, 8.

Keywords

Modular Group Free Subgroup Congruence Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. [1]
    I Reiner,Normal subgroups of the unimodular group. Illinois J. Math. 2, 142–144 (1958).zbMATHMathSciNetGoogle Scholar
  2. [2]
    G. Sansone,Problemi insoluti nella teoria delle sostituzioni lineari. Conv. Internaz. di Teoria dei Gruppi Finiti (Firenze 1960) 5.19. Edizione Cremonese Rome 1960.Google Scholar

Copyright information

© Nicola Zanichelli Editore 1964

Authors and Affiliations

  • Morris Newman

There are no affiliations available

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