A ring is semiperfect if and only if every finitely generated free $R$-module is co-coatomically semiperfect.
📌 3 Maddede Bu Makale
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Amaç & Hipotez:In this paper it is shown that a factor module of an $\oplus$-co-coatomically supplemented module is not in general $\oplus$-co-coatomically supplemented.
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Temel Bulgular & Veri:If $M$ is $\oplus$-co-coatomically supplemented and $U$ is a fully invariant submodule of $M$, then $M/U$ is $\oplus$-co-coatomically supplemented.
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Sonuç & Katkı:A ring is semiperfect if and only if every finitely generated free $R$-module is co-coatomically semiperfect.
In this paper it is shown that a factor module of an $\oplus$-co-coatomically supplemented module is not in general $\oplus$-co-coatomically supplemented. If $M$ is $\oplus$-co-coatomically supplemented and $U$ is a fully invariant submodule of $M$, then $M/U$ is $\oplus$-co-coatomically supplemented. A ring $R$ is left perfect if and only if $R^{(\mathbb{N})}$ is an $\oplus$-co-coatomically supplemented $R$-module. A projective module $M$ is co-coatomically semiperfect if and only if $M$ is $\oplus$-co-coatomically supplemented. A ring is semiperfect if and only if every finitely generated free $R$-module is co-coatomically semiperfect.
ALİZADE, R., GÜNGÖR, S. (2018). $\oplus$-co-coatomically supplemented and co-coatomically semiperfect modules. Hacettepe Journal of Mathematics and Statistics, Cilt: 47 Sayı: 6, 1417–1426. https://ajindex.com/articles/929260
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