Normal subgroups of low index in the modular group and other Hecke groups

Conder, Marston; Dobcsanyi, Peter

Normal subgroups of low index in the modular group and other Hecke groups

Conder, Marston ; Dobcsanyi, Peter

Identifier: http://hdl.handle.net/2292/5130

Issue Date: 2003-06

Reference: Department of Mathematics - Research Reports-496 (2003)

Rights: The author(s)

Rights (URI): https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm

Abstract:

An account is given of the determination of all normal subgroups of index up to $1500$ in the modular group PSL$(2,Z) cong C_2 * C_3$, and all normal subgroups of index up to $500$ in the Hecke groups $H_q = C_2 * C_q$ for $4 le q le 12$, using an adaptation of the low index subgroups algorithm.

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