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Here in the exercice, I have to show that $(Z[t],+, . )$ and $(Q[t],+, .) $ are not isomorphic.
I know the answer! I am simply wondering if it would be true that, showing that $(Z,+, . )$ and $(Q,+, . )$ are not isomorphic is sufficient to say that the polynomial rings are also not isomorphic.
If not, can you find me a counter example?