Rafail AlizadeSerpil GungorAlizade, RafailGungor, Serpil2025-10-0620181303-50102651-477X10.15672/HJMS.201544138442-s2.0-85073872124http://dx.doi.org/10.15672/HJMS.20154413844https://gcris.yasar.edu.tr/handle/123456789/6173https://search.trdizin.gov.tr/en/yayin/detay/297237https://doi.org/10.15672/HJMS.20154413844In this paper it is shown that a factor module of an circle plus-co-coatomically supplemented module is not in general circle plus-co-coatomically supplemented. If M is circle plus-co-coatomically supplemented and U is a fully invariant submodule of M then M/U is circle plus-co-coatomically supplemented. A ring R is left perfect if and only if R-(N) is an circle plus-co-coatomically supplemented R-module. A projective module M is co-coatomically semiperfect if and only if M is circle plus-co-coatomically supplemented. A ring is semiperfect if and only if every finitely generated free R-module is co-coatomically semiperfect.Englishinfo:eu-repo/semantics/closedAccessCo-coatomic submodule, circle plus-co-coatomically supplemented module, co-coatomically semiperfect moduleRINGSCo-Coatomic SubmoduleCo-Coatomically Semiperfect ModuleMatematikCircle Plus-Co-Coatomically Supplemented Module⊕-Co-Coatomically Supplemented ModuleArticle