DIRECT SUMS OF SEMI-PROJECTIVE MODULES
COLLOQUIUM MATHEMATICUM, cilt.127, sa.1, ss.67-81, 2012 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 127 Sayı: 1
- Basım Tarihi: 2012
- Doi Numarası: 10.4064/cm127-1-5
- Dergi Adı: COLLOQUIUM MATHEMATICUM
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.67-81
- Hacettepe Üniversitesi Adresli: Evet
Özet
We investigate when the direct sum of semi-projective modules is semi-projective. It is proved that if R is a right Ore domain with right quotient division ring Q not equal R and X is a free right R-module then the right R-module Q circle plus X is semi-projective if and only if there does not exist an R-epimorphism from X to Q