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Recall that a module is called
There is quite a bit of work on semisimple and pure semisimple modules, of course. My question is What is a module called if every submodule is pure? and What is known about these modules and where can I read about them? |
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Hmmm, I seem to have found the answer to this question. In Regular and semisimple modules by Cheatham and Smith in 1976, they call a module regular if every submodule is pure. Regular is of course an overused word, and maybe other people have called this different things. But the justification makes some sense: if I is a 2-sided ideal of R, then R/I is a regular R-module if and only if R/I is a von Neumann regular ring. |
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if R be a discrete valuation ring and M ba an R-module such that the annihilator of M isn't zero , then every pure submodule of M is a direct sum. you can see some result about the question in this book " Modules over discrete valuation ring". |
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