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• 35 Is there a notion of polynomial ring in "one half variable"?
• 33 Non-abelian group with infinitely many abelian subgroups
• 29 Is there a field $F$ which is isomorphic to $F(X,Y)$ but not to $F(X)$?
• 25 Do there exist numbers normal in every base except for one?
• 25 Is there any palindromic power of $2$?
• 23 If $A[X] \cong B[X]$ as rings, are the degrees of irreducible polynomials the same in $A$ and in $B$?
• 21 How do you simplify this square root of sum: $\sqrt{7+4\sqrt3}$?
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