A New Proof and an Extension of a Theorem of Millington on the Modular Group

DOI10.1112/blms/17.5.458zbMath0553.20028OpenAlexW2049461592MaRDI QIDQ3346490

Ravindra S. Kulkarni

Publication date: 1985

Published in: Bulletin of the London Mathematical Society (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1112/blms/17.5.458

zbMATH Keywords

indexgenusfree productRiemann-Hurwitz formulasubgroups of the modular groupnumber of elliptic branch points

Mathematics Subject Classification ID

Subgroup theorems; subgroup growth (20E07) Fuchsian groups and their generalizations (group-theoretic aspects) (20H10) Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations (20E06) Fuchsian groups and automorphic functions (aspects of compact Riemann surfaces and uniformization) (30F35)

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Arithmetic and geometry of the Hecke groups ⋮ Commutator subgroups of generalized Hecke and extended generalized Hecke groups,II ⋮ Statistics of isomorphism types in free products.

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