Rings over which every module has a flat delta-cover
TURKISH JOURNAL OF MATHEMATICS, cilt.37, sa.1, ss.182-194, 2013 (SCI-Expanded, Scopus, TRDizin)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 37 Sayı: 1
- Basım Tarihi: 2013
- Doi Numarası: 10.3906/mat-1009-19
- Dergi Adı: TURKISH JOURNAL OF MATHEMATICS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
- Sayfa Sayıları: ss.182-194
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Hacettepe Üniversitesi Adresli: Evet
Özet
Let M be a module. A delta-cover of M is an epimorphism from a module F onto M with a delta-small kernel. A delta-cover is said to be a flat delta-cover in case F is a flat module. In the present paper, we investigate some properties of (flat) delta-covers and flat modules having a projective delta-cover. Moreover, we study rings over which every module has a flat delta-cover and call them right generalized delta-perfect rings. We also give some characterizations of delta-semiperfect and delta-perfect rings in terms of locally (finitely, quasi-, direct-) projective delta-covers and flat delta-covers.