A ring is called left quasi - morphic, if for each a∈ R, there exist b and c in R such that Ra = l（b） and l（a） Rc. The main theorem of this paper is that, the formal triangular matrix rings T={（mb,a0）a∈A：b∈B,m∈A} M of （B,A） -bimoduleMis quasi - morphic if and only ifA, B is quasi -morphic and M = 0. This leads to investigate the quasi - morphic property of comer ring R, where R is a quasi - morphic ring.%环R称为左Quasi—morphic环，是指对任意a∈R都存在6，c∈R使得Ra=f（6）并且l（a）=Rc。文章主要证明了：BMA的形式三角矩阵环T={（mb,a0）a∈A：b∈B,m∈A}是Quasi—morphic当且仅当A．B是Quasi—morphic并且M=0。这个结果引导我们研究了Quasi—morphic环的comer环的Quasi—morphic性。
展开▼
