Article contents
Subgroups of infinite index in the modular group III
Published online by Cambridge University Press: 18 May 2009
Extract
As in [4], a specification is a list (r, s, t1 h0, hmc (l), …, c(ho)) such that
(i) each of r, s, t1 h0, h∞ is a non-negative integer,
(ii) for each i, c(i) is a positive integer,
(iii) if h∞ = 0 then ho = ∞,
(iv) if h∞ = 1 and t1 + h0 is finite then t1 is even,
(v) r + s + t1 + h0 + h∞ = ∞.
- Type
- Research Article
- Information
- Copyright
- Copyright © Glasgow Mathematical Journal Trust 1981
References
REFERENCES
- 4
- Cited by