Abstract
SynopsisA new formula is obtained for the number of subgroups of given index in the modular group. The formula is used to prove a recent conjecture on the parity of the number of subgroups.
Publisher
Cambridge University Press (CUP)
Reference6 articles.
1. 6 Stothers W. W. On some discrete triangle groups (Cambridge Univ. Ph.D. Thesis, 1971).
2. Subgroups of the modular group
3. Asymptotic formulas related to free products of cyclic groups
4. Subgroups of the classical modular group;Millington;J. London Math. Soc.,1970
Cited by
23 articles.
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