摘要
本文证明了具有ｎ（ｎ≥２）个左（右）零因子的环Ｒ，当｜Ｒ｜＜ｎ２时。
This paper shows | R|≤n 2/2 where R is a ring which has n(n ≥2) left (or right) divisors of zero and | R|≤n 2 .
关键词
零因子环
有限环
左零因子
上界
结合环
元数
lefr (right) zero divisor ring with zero divisors ring with no zero divi sors
