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Results tagged with examples
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user 17761
For questions requesting examples of a certain structure or phenomenon
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votes
Examples of seemingly elementary problems that are hard to solve?
Take two commutative rings $A$ and $B$ such that the polynomial rings $A[X]$ and $B[X]$ are isomorphic. Does this imply that $A$ and $B$ are isomorphic? (I think this is still open.)