象遗传环经过内射环刻画一样,通过min-内射环刻画了SP-环.同时,用GP-内射环刻画了GPP环,把PP环推广到了AP环,并且得到了比PP环更广泛的结果.
In this paper, the right SP rings are characterized via mininjective rings, just as hereditary tings are characterized via injective rings, at the same time, the GPP tings are characterized via GP-injective rings. Moreover, the PP rings are extended to AP rings, and some more general results about AP rings are obtained.