On the existence of maximal subgroups in amalgamated free products. (English) Zbl 0441.20017
MSC:
20E06 | Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations |
20E28 | Maximal subgroups |
20E07 | Subgroup theorems; subgroup growth |
20E15 | Chains and lattices of subgroups, subnormal subgroups |