GχI内射模
GχI-Injective Module
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摘要: 利用Gχ-内射模引入了一种新的模类GχI-内射模.如果对任意的Gχ-内射模N,有ExtR1(N,M)=0,称左R-模M是GχI-内射模.之后讨论了这类模的一些同调性质,并且探索了Gχ-内射模、内射模与GχI-内射模之间的关系.而且利用GχI-内射模给出了半单环的一个新刻画,每个左R-模是强GχI-内射的当且仅当每个Gχ-内射左R-模是投射的当且仅当R是半单环.我们还讨论了模的GχI-内射维数,给出了该维数的一些等价刻画.Abstract: In this paper, Gχ-injective module is firstly used to introduce a new type of GχI-injective module,a left R-module M is GχI-injective module,if ExtR1(N,M)=0 for any Gχ-injective leftR-module.Then some homological properties of these modules are given.Furthermore,the relationship between Gχ-injective module,injective module and is explored.And a new characterization of semi-simple ring is proved,each left R-module is strong Gχ-injective module if and only if every Gχ-injective module is projective,if and only if R is a semi simple ring.At last,we also discuss the dimension of GχI-injective module and give some equivalent descriptions of this dimension.
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Key words:
- Gχ-injective module /
- GχI-injective module /
- Gχ-injective dimension /
- GχI-injective dimension .
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