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    Rd-Subinjectivity domain of modules
    (Springer-Verlag Italia Srl, 2024) Moradzadeh-Dehkordi, Ali; Alagoz, Yusuf
    Given modules M and A, M is said to be A-RD-subinjective if for every RD-extension B of A, every f is an element of Hom(A,M) extends to Hom(B,M). For a module M, the RD-subinjectivity domain of M is defined to be the collection of all modules A such that M is A-RD-subinjective. We investigate basic properties of RD-subinjectivity domains and provide characterizations for various types of rings and modules including p-injective modules, RD-coflat modules, von Neumann regular rings, RD-rings, Kothe rings, right Noetherian rings, and quasi-Frobenius rings in terms of RD-subinjectivity domains. Finally, we study the properties of RD-indigent modules and consider the structure of rings over which every (resp. simple) right module is RD-injective or RD-indigent.