We classify the nilpotent finite groups G which are such that the unit group ลฝ . U U ZG of the integral group ring ZG has a subgroup of finite index which is the direct product of noncyclic free groups. It is also shown that nilpotent finite groups having this property can be characterised by means
Generators of Large Subgroups of Units of Integral Group Rings of Nilpotent Groups
โ Scribed by A. Giambruno; S.K. Sehgal
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 207 KB
- Volume
- 174
- Category
- Article
- ISSN
- 0021-8693
No coin nor oath required. For personal study only.
โฆ Synopsis
Let (G) be a finite nilpotent group so that all simple components ((D){n \times n}, n \geq 2) of (Q G) satisfy the congruence subgroup theorem. Suppose that for all odd primes (p) dividing (|G|) the Hamiltonian quaternions (H) split over the (p) th cyclotomic field (Q\left(\zeta{p}\right)). Then new units (\mathscr{A}{3}) are introduced so that (\left\langle\mathscr{T}{1}, \mathscr{B}{2}, \mathscr{B}{2}^{\prime}, \mathscr{S}_{3}\right\rangle) is of finite index in (U(\mathbb{Z} G) . \bigcirc 1995) Academic Press, Inc.
๐ SIMILAR VOLUMES
We classify all the finite groups G, such that the group of units of ZG contains a subgroup of finite index which is isomorphic to a direct product of nonabelian free ลฝ groups. This completes the work of Jespers, Leal, and del Rฤฑo J. Algebra 180 ลฝ . . 1996 , 22แ40 , where the nilpotent groups with
This paper deals with the isomorphism problem for integral group rings of infinite groups. In the first part we answer a question of Mazur by giving conditions for the isomorphism problem to be true for integral group rings of groups that are a direct product of a finite group and a finitely generat