摘要
通过Q取τ-内射性,τ-投射性,τ-可除性和τ-余可除性,分别得到相应的包和盖的概念.讨论τ-挠内射包,τ-挠投射盖,τ-挠自由可除包和τ-挠自由余可除盖的性质,并利用它们刻画了τ-内射包Eτ(M).
Introduce the corresponding concepts of cover and hull through Q gets the properties of τ-injective,τ-projective,τ-divisible and τ-codivisible,discuss the properties of τ-torsion injective hull, τ-torsion projective cover,τ-torsionfree divisible hull and τ-torsionfree codivisible cover, τ-injective hull E_τ(M) is characterized by using them.
出处
《福建师范大学学报（自然科学版）》
CAS
CSCD
2004年第2期4-7,共4页
Journal of Fujian Normal University：Natural Science Edition
基金
福建省科技厅基金资助项目(K20080)
福建省教育厅基金资助项目(JA00152)
关键词
τ-挠内射包
τ-挠投射盖
τ-挠自由可除包
τ-挠自由余可除盖
τ-torsion injective hull
τ-torsion projective cover
τ-torsionfree divisible hull
τ-torsionfree codivisible cover
