what does it mean, if you say, that the class of $\prod U_i$ in $R$ is an invariant of a module, where the $U_i$ are ideals in a ring $R$. I cannot find a definition. Thanks for help
Does anyone knows this definition? (class is an ivariant)
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$\begingroup$
abstract-algebra
ring-theory
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0this is mentioned e.j. in Lemma 1.4 on page 217: http://www.ams.org/journals/tran/1964-110-02/S0002-9947-1964-0156896-7/S0002-9947-1964-0156896-7.pdf – 2012-06-14
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1Refer to the topic in the title please. – 2012-06-14