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A theorem of Faith and Walker asserts that a ring R is quasi-Frobenius if and only if every injective right R-module is projective and hence that every right module over a quasi-Frobenius ring embeds in a free module. There is an open question here. If we call a ring R a right FGF-ring if every finitely generated right R-module can be embedded in a free right R-module, it is not known if the following assertion is true: The FGF- Conjecture. Every right FGF -ring is quasi-Frobenius. Here are four important results on th conjecture: (1) every left Kash , right FGF-ring is quasi-Frobenius. (2) every right self-injective, right FGF-ring is quasi Frobenius. (3) every right perfect, right FGF-ring is quasi-Frobenius. (4) ever right CS, right FGFring is quasi-Frobenius. We then turn to the fundamental work of Gomez Pardo and Guil Asensio. A ring R is called aright CF- ring if every cyclic (that is principal) right R-module can be embedded in a free module. The open question here is as follows:The CF-conjecture : every right CF-ring is right artinian . Referring to (4) from the preceding list, Gomez Pardo and Guil Asensio prove that every right CS, right CF-ring is right artinian. The paper concludes with a relation between CF-ring and CEP-ring .
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