设R是结合环,如果对每个x∈R,有依赖于x的正整数n=n(x)及fx(t)∈Z[t]使得x^n(x)x^n(x)+1fn(x),则称R为广义周期环。刻画了只有一个非零幂等元的广义周期环。
A ring R is called a generalized periodic ring, if for every x∈R there exist a positive in-teger n = n (x) depending on x and a polynomial fx (t) ∈ Z [ t ] such that x^n(x) = x^n(x) +1fx (x). General-ized periodic rings with a unique nonzero idempotent element are characterized.