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Semi-Primary QF-3 Rings

Published online by Cambridge University Press:  22 January 2016

R. R. Colby and
Edgar A. Rutter Jr.
R. R. Colby
Affiliation:
The University of Kansas
Edgar A. Rutter Jr.
Affiliation:
The University of Kansas
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A ring R (with identity) is semi-primary if it contains a nilpotent ideal N with R/N semi-simple with minimum condition. R is called a left QF-3 ring if it contains a faithful projective injective left ideal. If R is semi-primary and left QF-3, then there is a faithful projective injective left ideal of R which is a direct summand of every faithful left R-module [5], in agreement with the definition of QF-3 algebra given by R.M. Thrall [6]. Let Q(M) denote the injective envelope of a (left) R-module M. We call R left QF-3+ if Q(R) is projective. J.P. Jans showed that among rings with minimum condition on left ideals, the classes of QF-3 and QF-3+ rings coincide [5].

Information

Type
Research Article
Information
Nagoya Mathematical Journal , Volume 32 , June 1968, pp. 253 - 258
Copyright
Copyright © Editorial Board of Nagoya Mathematical Journal 1968

References

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