CHARACTERIZATIONS OF LIFTING MODULES IN TERMS OF COJECTIVE MODULES AND THE CLASS OF ℬ (M, X)

N Orhan, DK TÜTÜNCÜ - International Journal of Mathematics, 2005 - World Scientific
N Orhan, DK TÜTÜNCÜ
International Journal of Mathematics, 2005World Scientific
In this note, we introduce the (small, pseudo-) ℬ (M, X)-cojective modules and we generalize
(small, pseudo-) cojective modules via the class ℬ (M, X). Let M= M1⊕ M2 be an X-amply
supplemented module with the finite internal exchange property. Then for every
decomposition of M= Mi⊕ Mj, Mi is ℬ (Mj, X)-cojective for i≠ j, M1 and M2 are X-lifting if and
only if M is X-lifting. We also prove that for an X-amply supplemented module M= M1⊕ M2
such that M1 and M2 are indecomposable X-lifting modules, if M2 is ℬ (M1, X)-cojective and …
In this note, we introduce the (small, pseudo-)ℬ(M,X)-cojective modules and we generalize (small, pseudo-)cojective modules via the class ℬ(M,X). Let M = M1 ⊕ M2 be an X-amply supplemented module with the finite internal exchange property. Then for every decomposition of M = Mi ⊕ Mj, Mi is ℬ(Mj,X)-cojective for i ≠ j, M1 and M2 are X-lifting if and only if M is X-lifting. We also prove that for an X-amply supplemented module M = M1 ⊕ M2 such that M1 and M2 are indecomposable X-lifting modules, if M2 is ℬ(M1,X)-cojective and M1 is small-ℬ(M2,X)-cojective then M is X-lifting.
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