给出NIFP环的定义,研究NIFP环的一些性质.主要证明了如下结果:①NIFP环是直接有限环;②NIFP环是左极小Abel环;③设R为NIFP环,若x∈R是exchange元,则x是clean元;④设R为NIFP环,x∈R,n∈Z+,若xn是clean元,则x也是clean元;⑤NIFP的左WGC2环是左GC2环.
In this paper, the notion of NIFP rings is introduced and some properties of NIFP rings are studied. The following results are obtained: (1) NIFP rings are directly finite; (2) NIFP rings are left min-Abel; (3) Let R be a NIFP ring. If x∈R is exchange, then x is clean; (4) Let R be a NIFP ring, x∈R andn∈Z+. Ifx^nis clean, thenxis clean; (5) NIFPleft WGC2 rings are left GC2.