Rings for which every simple module is almost injective

S Asgari, M Arabi-Kakavand… - Bulletin of the Iranian …, 2016 - bims.iranjournals.ir
S Asgari, M Arabi-Kakavand, H Khabazian
Bulletin of the Iranian Mathematical Society, 2016bims.iranjournals.ir
We introduce the class of “right almost V-rings” which is properly between the classes of
right V-rings and right good rings. A ring R is called a right almost V-ring if every simple R-
module is almost injective. It is proved that R is a right almost V-ring if and only if for every R-
module M, any complement of every simple submodule of M is a direct summand. Moreover,
R is a right almost V-ring if and only if for every simple R-module S, either S is injective or the
injective hull of S is projective of length 2. Right Artinian right almost V-rings and right …
We introduce the class of “right almost V-rings” which is properly between the classes of right V-rings and right good rings. A ring R is called a right almost V-ring if every simple R-module is almost injective. It is proved that R is a right almost V-ring if and only if for every R-module M, any complement of every simple submodule of M is a direct summand. Moreover, R is a right almost V-ring if and only if for every simple R-module S, either S is injective or the injective hull of S is projective of length 2. Right Artinian right almost V-rings and right Noetherian right almost V-rings are characterized. A 2×2 upper triangular matrix ring over R is a right almost V-ring precisely when R is semisimple.
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