On the Residual Finiteness of Some Generalized Products of Soluble Groups of Finite Rank
https://doi.org/10.18255/1818-1015-2013-1-124-132
Abstract
Let G be a free product of residually finite virtually soluble groups A and B of finite rank with an amalgamated subgroup H, H 6= A and H 6= B. And let H contains a subgroup W of finite index which is normal in both A and B. We prove that the group G is residually finite if and only if the subgroup H is finitely separable in A and B. Also we prove that if all subgroups of A and B are finitely separable in A and B, respectively, all finitely generated subgroups of G are finitely separable in G.
About the Author
A. V. RozovRussian Federation
аспирант,
ul. Ermaka, 39, Ivanovo, 153025 Russia
References
1. Baumslag G. On the residual finiteness of generalized free products of nilpotent groups // Trans. Amer. Math. Soc. 1963. Vol. 106. P. 193–209.
2. Hirsh K.A. On infinite soluble groups // J. London Math. Soc. 1952. Vol. 27. P. 81–85.
3. Азаров Д. Н. О финитной аппроксимируемости свободного произведения двух групп с объединенными подгруппами конечных индексов // Вестн. Иван. гос. ун-та. 2007. Вып. 3. С. 55–59. (Azarov D. N. O finitnoy approksimiruyemosti svobodnogo proizvedeniya dvukh grupp s ob"yedinennymi podgruppami konechnykh indeksov // Vestn. Ivan. gos. unta. 2007. Vyp. 3. P. 55–59 [in Russian].)
4. Азаров Д.Н. О почти аппроксимируемости конечными p-группами // Чебышевский сборник. Тула, 2010. Т. 11. Вып. 3(35). С. 11–21. (Azarov D.N. O pochti approksimiruyemosti konechnymi p-gruppami // Chebyshevskiy sbornik. Tula, 2010. T. 11. Vyp. 3(35). P. 11–21 [in Russian].)
5. Allenby R. B. J. T., Gregorac R. J. On locally extended residually finite groups // Lecture Notes Math. 1973. Vol. 319. P. 9–17.
6. Мальцев А. И. О группах конечного ранга // Мат. сб. 1948. Т. 22. № 2. С. 351–352. (Maltsev A.I. On groups of finite rank // Mat. Sbornik. 1948. V. 22, No 2. P. 351–352 [in Russian].)
7. Lennox J., Robinson D. The theory of infinite soluble groups. Oxford: Clarendon press, 2004.
8. Мальцев А. И. О гомоморфизмах на конечные группы // Учен. зап. Иван. гос. пед. ин-та. 1958. Т. 18. С. 49–60. (Maltsev A. I. O gomomorfizmakh na konechnyye gruppy // Uchen. zap. Ivan. gos. ped. in-ta. 1958. T. 18. P. 49–60 [in Russian].)
9. Shirvani M. A converse to a residual finiteness theorem of G. Baumslag // Proc. Amer. Math. Soc. 1988. Vol. 104. № 3. P. 703–706.
Review
For citations:
Rozov A.V. On the Residual Finiteness of Some Generalized Products of Soluble Groups of Finite Rank. Modeling and Analysis of Information Systems. 2013;20(1):124-132. (In Russ.) https://doi.org/10.18255/1818-1015-2013-1-124-132