Let $M$ be an $R$ module. Is this true for start a proof that we say "Let $S$ denote the indecomposable summands of $M$"?
In fact,
I want to know whether any module over a Dedekind domain (or a DVR) has an indecomposable summand.
Thanks.
2026-03-25 23:35:51.1774481751
indecomposable summand
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