On absolute direct injective modules
摘要
The paper is focused on a question: What can be said of a module which is ADS and has the C2 property? raised by Alahmadi, Jain and Leroy: ADS modules. Modules that are both ADS and C2 are called absolute direct injective modules (briefly, AC2 modules). This new class of modules contains the classes of automorphism-invariant modules and continuous modules.