内射子、双内射子及平坦子、上平坦子

Injectors, Bi-injectors, Flatjectors and Coflatjectors

本文引进了双内射子的概念，给出了内射子、平坦子、完全内射子、上平坦子的一些新刻划．对环R上的有限生成投身模的自同态环，以及其与环R之间的关系进行了广泛的讨论．

In this paper, hi-injectors are defined. Some new representations of injectors,flatjectors, perfect injectors and coflatjectors are given. Endomorphism ring S of finitely generated modules over R and some relations between ring R and ring S are discussed.