On some radicals and proper classes associated to simple modules
نویسندگان
چکیده
For a unitary right module M , there are two known partitions of simple modules in the category σ[M ]: the first one divides them into M -injective modules and M -small modules, while the second one divides them into M -projective modules and M -singular modules. We study inclusions between the first two and the last two classes of simple modules in terms of some associated radicals and proper classes. 2010 MSC: 16S90, 16D60, 16D50, 16D40, 16D90
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