## dedicated to k. doerk on his 60th birthday Given two subgroups U V of a finite group which are subnormal subgroups of their join U V and a formation , in general it is not true that U V = U V . A formation is said to have the Wielandt property if this equality holds universally. A formation wit
On superstable groups with residual properties
โ Scribed by Abderezak Ould Houcine
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 156 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0044-3050
No coin nor oath required. For personal study only.
โฆ Synopsis
Given a pseudovariety C, it is proved that a residually-C superstable group G has a finite series
In particular, a residually finite superstable group is solvable-by-finite, and if it is ฯ-stable, then it is nilpotent-by-finite. Given a finitely generated group G, we show that if G is ฯ-stable and satisfies some residual properties (residual solvability, residual finiteness, . . . ), then G is finite.
๐ SIMILAR VOLUMES
## Abstract In this note we treat maximal and minimal normal subgroups of a superstable group and prove that these groups are definable under certain conditions. Main tool is a superstable version of Zil'ber's indecomposability theorem. MSC: 03C60.
We show that every word-hyperbolic group is residually finite if and only if every word-hyperbolic group has a finite quotient.
We show that certain properties of groups of automorphisms can be read off from the actions they induce on the finite characteristic quotients of their underlying group G. In particular, we obtain criteria for groups of automorphisms of a ลฝ . residually finite and soluble minimax -by-finite group G