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Mathematics
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Alex W

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 4 years, 2 months
  • 99 profile views
  • Last seen Jun 13 at 22:08

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Top posts (42) All Questions Answers | Votes Newest

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 '15
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 '15
5 Proving that $SL_2(\mathbb{Z}_5) / \{\pm I\}\simeq A_5$ May 16 '15
4 about center of group rings $RG$ and $(R/I)G$ May 15 '15
4 kernels of powers of linear maps May 9 '15
4 Proof that $\gcd(2^m-1,2^n+1)=1$ for odd $m$ using group theory May 12 '15
3 about center of group rings $RG$ and $(R/I)G$ May 15 '15
2 Let $A,B\in \Bbb{K}^{n^2}, B\neq0$ prove that if $AB=0$ then $A$ is not invertible. Jun 3 '15
2 Proof of Existence of Algebraic Closure: Too simple to be true? Mar 20 '16
2 Determining if $\mathbb{Z}[a]$ is a discrete subring of $\mathbb{C}$. May 12 '15
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