How to find multiplicative inverse of $17$ in $\mathbb{Z}_{26}$?
97303
Calculate the multiplicative inverse modulo a composite number
122312
How can I compute $\mathrm{Aut}(\mathbb{Z}/4\mathbb{Z}\times\mathbb{Z}/6\mathbb{Z})$?
122698
Construction of multiplicative group of complex numbers
145112
Show that the multiplicative group $(\mathbb{Z}/p\mathbb{Z})^*$ is cyclic
57846
Multiplicative inverse in $\operatorname{GF}(2^8)$?
136855
Proof that $\mathbb{Z}\left[\frac{1 + \sqrt{-19}}{2}\right]$ is a PID
97150
Solve $[2^{(2^{403})}] = [a]$ in $\mathbb Z_{23}$ where $0 \le a < 23$.
6837
How to quotient $\mathbb Z [\sqrt{-11}] / (1+\sqrt{-11})$?
146534
Find out trace of a given matrix $A$ with entries from $\mathbb{Z}_{227}$
115282
Showing that $\mathbb Q(\sqrt{17})$ has class number 1
51161
Finding the inverse of 84 mod 5
123482
How to compute $\mathbb{Z}_n^*$, the unit group of the integers modulo $n$?
6984
Inverting $a+b\sqrt{2}$ in the field $\Bbb Q(\sqrt{2})$
156834
Why are there $736$ matrices $M\in \mathcal M_2(\mathbb{Z}_{26})$ for which it holds that $M=M^{-1}$?
93031
How to show that $\mathbb{Z}$ with the operation $m*n=m+(-1)^m n$ is associative?
93760
There is an element of order $51$ in the multiplicative group $(Z/103Z)^∗.$
8434
Order of $\mathbb{Z}[i]/(1+i)$