kappa-Existentially closed groups
JOURNAL OF ALGEBRA, cilt.499, ss.298-310, 2018 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 499
- Basım Tarihi: 2018
- Doi Numarası: 10.1016/j.jalgebra.2017.12.005
- Dergi Adı: JOURNAL OF ALGEBRA
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.298-310
- Anahtar Kelimeler: Infinite symmetric groups, Universal groups, Centralizers of subgroups, Existentially closed groups
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
Let kappa is be an infinite cardinal. The class of kappa-existentially closed groups is defined and their basic properties are studied. Moreover, for an uncountable cardinal kappa, uniqueness of kappa-existentially closed groups are shown, provided that they exist. We also show that for each regular strong limit cardinal kappa, there exists kappa-existentially closed groups. The structure of centralizers of subgroups of order less than kappa in a kappa-existentially group G are determined up to isomorphism namely, for any subgroup F <= G(nu) in G with vertical bar F vertical bar < kappa, the subgroup C-G(F) is isomorphic to an extension of Z(F) by G. (C) 2017 Elsevier Inc. All rights reserved.