Mathematics
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Alex W
  • Member for 7 years, 4 months
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All Questions Answers
Score Newest
answer
8
An example of a mapping $\eta\colon\mathbb{N}\to\mathbb{N}$ such that $\eta(x)=n$ has infinitely many solutions for each $n\in\mathbb{N}$
May 17, 2015
answer
7
Show that the number of reduced residues $a \mod m$ such that $a^{m-1} \equiv 1 \mod m$ is exactly $\prod_{p \mid m} \gcd(p-1,m-1).$
May 23, 2015
answer
6
Proving that $SL_2(\mathbb{Z}_5) / \{\pm I\}\simeq A_5$
May 16, 2015
answer
5
kernels of powers of linear maps
May 9, 2015
answer
4
Linear independence of $\sin(x)$, $\sin(2x)$, $\sin(3x)$ in Map($\mathbb{R},\mathbb{R}$)
May 15, 2015
answer
4
There is no proper subgroup of $\mathbb Q$ of finite index
Apr 2, 2016
answer
4
about center of group rings $RG$ and $(R/I)G$
May 15, 2015
answer
3
about center of group rings $RG$ and $(R/I)G$
May 15, 2015
answer
3
Proof that $\gcd(2^m-1,2^n+1)=1$ for odd $m$ using group theory
May 12, 2015
answer
2
For a group ring, finding if a subset is an ideal.
May 11, 2015

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