Almost Abelian rings
Almost Abelian rings
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几乎阿贝尔环
作者:
魏俊潮
A ring R is dened to be left almost Abelian if ae = 0 implies aRe = 0 for a 2 N(R) and e 2 E(R), where E(R) and N(R) stand re- spectively for the set of idempotents and the set of nilpotents of R. Some characterizations and properties of such rings are included. It follows that if R is a left almost Abelian ring, then R is -regular if and only if N(R) is an ideal of R and R=N(R) is regular. Moreover it is proved that (1) R is an Abelian ring if and only if R is a left almost Abelian left idempotent reexive ring. (2) R is strongly regular if and only if R is regular and left almost Abelian. (3) A left almost Abelian clean ring is an exchange ring. (4) For a left almost Abelian ring R, it is an exchange (S; 2) ring if and only if Z=2Z is not a homomorphic image of R.
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