摘要
设M和N是模,本文定义了Hom(M,N)的单边单位正则性.证明了当Hom(M,N)正则时,以下结论是等价的:(1)Hom(M,N)是单边单位正则的.(2)对任意的α∈Hom(M,N),存在一个EM或EN中的幂等元e和一个单边可逆元γ∈Hom(M,N),使得α=eγ或α=γe.(3)对任意的α∈Hom(M,N),存在一个EM或EN中的幂等元e和一个单边单位正则元δ∈Hom(M,N),使得α=eδ或α=δe.(4)对任意的α∈Hom(M,N),存在单边可逆元γ∈Hom(N,M),使得αγ是Em中的幂等元或γα是EN中的幂等元.
Let M and N be modules, the concept of one-sided unit regularity of Hom(M,N) is given. If Hom(M,N) is regular, the following conclusions are equivalent: (1) Hom(M,N) is one-sided unit regular. (2) For every α∈ Hom(M,N), there exists an idempotent e∈EM or e∈EN and a right or left invertible γ∈ Hom(M, N) such that α=eγ or α=γe. (3) For every α∈ Hom(M, N), there exists an idempotent e∈EM or e∈EN and a one-sided unit regular element δ∈ Hom(M,N) such that α=eδ or α=δe. (4) For every α∈ Hom(M,N), there exists a right or left invertible γ∈Hom(N,M) such that αγ is an idempotent of EM or γa is an idempotent of EN.
出处
《西北师范大学学报(自然科学版)》
CAS
2007年第6期19-21,共3页
Journal of Northwest Normal University(Natural Science)
关键词
正则
单边单位正则
态射
单边可逆元
regular
one-sided unit regular
morphism
right or left invertible element