DIRECT SUMS OF SEMI-PROJECTIVE MODULES


Tutuncu D. K. , KALEBOĞAZ B. , Smith P. F.

COLLOQUIUM MATHEMATICUM, cilt.127, ss.67-81, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 127 Konu: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.4064/cm127-1-5
  • Dergi Adı: COLLOQUIUM MATHEMATICUM
  • Sayfa Sayıları: ss.67-81

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