The commutator subgroup and the index formula of the Hecke group H₅

Articles in the same Issue

1. Frontmatter
2. Quotients and subgroups of Baumslag–Solitar groups
3. Quasi-actions and generalised Cayley–Abels graphs of locally compact groups
4. Quotients of trees for arithmetic subgroups of PGL₂ over a rational function field
5. The commutator subgroup and the index formula of the Hecke group H₅
6. On the height of subgroups of Homeo₊(I)
7. On the proof of a theorem by Carlitz
8. Non-solvable groups generated by involutions in which every involution is left 2-Engel
9. A dual version of Huppert's conjecture on conjugacy class sizes
10. p-divisibility of conjugacy class sizes and normal p-complements
11. Derangements in cosets of primitive permutation groups
12. M₉-free groups