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- 2017
相对于理想的环的刻画
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Abstract:
摘要： 设I是环R的理想, 引入伪半投射I-盖的概念。 证明了每一个左R-模有伪半投射I-盖当且仅当每一个左R-模有投射I-盖, 并证明了伪半投射模构成的类是投射类, 进而推广了一些已有的结论。
Abstract: Let I be an ideal of a ring R. The concept of pseudo semiprojective I-covers is introduced. It is shown that every left R-module has a pseudo semiprojective I-cover if and only if every left R-module has a proj-ective I-cover. It is also proved that the class of all pseudo semiprojective modules is a projectivity class, and then some well known results are generalized
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