ON π-EXACT SEQUENCES AND π-PROJECTIVE MODULES
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Let R be a commutative ring with prime nilradical Nil(R) and M an R-module. Define the map π : R β RNil(R) by Ο ( r ) = r 1 for r β R and π : M β MNil(R) by Ο ( x ) = x 1 for x β M. Then π(M) is a π(R)-module. An R-module P is said to be π-projective if π(P) is projective as a π(R)-module. In this paper, π-exact sequences and π-projective R-modules are introduced and the rings over which all R-modules are π-projective are investigated.
Abstract
Let R be a commutative ring with prime nilradical Nil(R) and M an R-module. Define the map π : R β RNil(R) by Ο ( r ) = r 1 for r β R and π : M β MNil(R) by Ο ( x ) = x 1 for x β M. Then π(M) is a π(R)-module. An R-module P is said to be π-projective if π(P) is projective as a π(R)-module. In this paper, π-exact sequences and π-projective R-modules are introduced and the rings over which all R-modules are π-projective are investigated.
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