A note on -modules.
In this paper we introduce the concept of -extending modules by -rational submodules and study some properties of such modules. It is shown that the set of all -rational left ideals of is a Gabriel filter. An -module is called -extending if every submodule of is -rational in a direct summand of . It is proved that is -extending if and only if , such that is a -extending submodule of . An example is given to show that the direct sum of -extending modules need not be -extending....
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