不同的内射性的研究在S-系研究中起着重要作用。通过定义C-内射S-系,讨论了C-内射系的性质、充分必要条件。给出了C-内射系的同调刻划。证明了有限内射系是C-内射的,C-内射系是主弱内射的,但对应的逆命题不成立。得到了所有左理想是C-内射的幺半群刻划及C^*半群上所有S-系是C-内射的同余刻划。
A new type of injective S -acts is defined, named C-injective S -acts. It is proved that finitely injective acts are C-injective and C-injective acts are principally weakly injective, but not conversely. Properties and sufficient and necessary conditions for C-injective acts are discussed. Characterizations for monoids all left ideals over which are C-injective and congruence characterizations for C^* monoids all acts over which are C-injective are obtained.