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Alex W
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Places where one can post open problems
Jan 19, 2023
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8
An example of a mapping $\eta\colon\mathbb{N}\to\mathbb{N}$ such that $\eta(x)=n$ has infinitely many solutions for each $n\in\mathbb{N}$
7
Show that the number of reduced residues $a \bmod m$ such that $a^{m-1} \equiv 1 \pmod m$ is exactly $\prod_{p \mid m} \gcd(p-1,m-1).$
6
Proving that $SL_2(\mathbb{Z}_5) / \{\pm I\}\simeq A_5$
6
kernels of powers of linear maps