PROOF. Let S be a simple right R/J module, then S is a simple right R-module, hence has an
R-projective cover. By [1, Lemma 2.2], S has an R/J projective cover. Since S was arbitrary, it …

Koh [2] has shown that a commutative ring with identity is semiperfect if and only if every
simple right module has a projective cover. The purpose of this note is to show that the …

On Semiperfect and Perfect Rings | CiNii Research CiNii 国立情報学研究所 学術情報ナビゲータ
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Koh [2] has shown that a commutative ring with identity is semiperfect if and only if every
simple right module has a projective cover. The purpose of this note is to show that the …

Koh [2] has shown that a commutative ring with identity is semiperfect if and only if every
simple right module has a projective cover. The purpose of this note is to show that the …

Koh [2] has shown that a commutative ring with identity is semiperfect if and only if every
simple right module has a projective cover. The purpose of this note is to show that the …