Where is my mistake in calculating duals? – mathoverflow.net

Where is my mistake in calculating duals? – mathoverflow.net

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Im confused and probably have a thinking error. Exercise 6 on page 420 of Lam's "Lectures on Modules and Rings" says the following: Let $R$ be a ring and $C$ a cyclic right $R$-module: $C=R/A$ with ...

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