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infinityQ
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The definition of R-algebra and R-module looks somewhat similar when R is a commutative ring.
For instance, R[x] is both an R-algebra and R-module.
I'll appreciate if anyone shows an example which is an R-algebra but not an R-module, and vice versa.
Thanks.
For instance, R[x] is both an R-algebra and R-module.
I'll appreciate if anyone shows an example which is an R-algebra but not an R-module, and vice versa.
Thanks.
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