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Mathematics
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Functor
  • Member for 2 years, 5 months
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  • China
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Love math

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25
Lang's elementary divisors theorem is wrong
Jul 14
4
Understanding flat modules
May 22
4
compute the Hilbert series of a free product of algebras
Sep 20, 2022
4
Can there be a subgroup $K$ of a group $G$ such that for some $a \in G$, $aK \subseteq Ka$ but $Ka \nsubseteq aK$?
Apr 27
3
Is the ring $R$ a free module over $S$?
Feb 26, 2022
3
Show that $(3,\sqrt [3]{11}+1)$ is a principal ideal in $\mathbb{Z}[\sqrt[3]{11}]$
Jul 16
3
Compact set covered by closed balls with positive radii
Jun 27
3
Proving a criterion for flatness of modules
Mar 15
3
The equivalent statement of torsion-free quasi-coherent sheaves of modules
Feb 21
2
If $p,q \in \Bbb{N}$ are different primes, then $\Bbb{Z}_p$ is a non free $\Bbb{Z}_{pq}$-module
Apr 30