Graphs and their strong endomorphism monoids are considered in this paper. 本文研究图及其强自同态幺半群。
It gets some results about the relation between the direct summands of an additive group and the summands of the endomorphism ring of this additive group. 得到了关于加法群的直和项与其自同态环的直和项间相互刻画的一些结论。