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Arkady
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29
Binomial coefficients modulo a prime
24
If $A[[x]]$ is Noetherian, will $A$ be Noetherian?
20
How can I prove $\sqrt{\sqrt2}$ to be irrational?
19
Are abelian subgroups normal?
17
The Hasse invariant at cuspidal elliptic curves in a generically ordinary family