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Watson
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52
Is there a notion of polynomial ring in "one half variable"?
Jun 2, 2020
29
Is there a field $F$ which is isomorphic to $F(X,Y)$ but not to $F(X)$?
Jan 3, 2017
20
Curves over number fields with everywhere good reduction
Dec 4, 2018
15
Torsion-free abelian group $A$ such that $A \not \simeq A \oplus \Bbb Z \simeq A \oplus \Bbb Z^2$
Feb 5, 2017
10
Where exactly is the flaw in this proof of the Kronecker–Weber theorem?
Feb 11, 2017
9
Analogue of the original Birch–Swinnerton-Dyer conjecture for abelian varieties
Sep 4, 2018
8
Isomorphic endomorphism algebras implies isogenous (for abelian varieties over finite fields)?
May 23, 2021
7
Simultaneous reductions of elliptic curves: same number of points $|E(\Bbb F_p)| = |E'(\Bbb F_p)|$ for some prime $p$?
Jun 3, 2021
4
Fontaine, J.-M.; Illusie, L. p-adic periods------Does any one have the following article?
Sep 24, 2018
2
Degree of morphisms and isogenies
Apr 12, 2020
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35
Non-abelian group with infinitely many abelian subgroups
30
Is there any perfect square in the sequence $12,123,1234,12345,...$?
27
Is there any palindromic power of $2$?
26
If $A[X] \cong B[X]$ as rings, are the degrees of irreducible polynomials the same in $A$ and in $B$?
25
Do there exist numbers normal in every base except for one?