Multiplicative inverses for $Z_n$
32108
$ a\in \Bbb Z_n$ is invertible $\,\Rightarrow\gcd (a,n) =1$
59134
Proving idempotent elements in $\mathbb{Z}_n$
145752
Aut $\mathbb Z_p\simeq \mathbb Z_{p-1}$
119052
Finding invertible elements in $\mathbb{Z}/m\mathbb{Z}$
63007
Number of self-inverse matrices over prime field
114519
An elementary question regarding a multiplicative character over finite fields
44879
Multiplicative inverse questions
98507
$\text{Aut}(F)$ is isomorphic to the multiplicative group of all $n\times n$ matrices over $\mathbb Z$
41742
inverse limit of $k[x]/(x^n)$
149364
Characteristic polynomial of an inverse
57846
Multiplicative inverse in $\operatorname{GF}(2^8)$?
10911
$A \in M_{n}(\mathbb{R})$ has inverse if and only if it's rank is n.
28934
Presentation of SL$(n,\mathbb{Z}_p)$
43683
Finding Inverse of 2 (mod m)
108589
The inverse of the matrix $\{1/(i+j-1)\}$
145561
About the additive group and the multiplicative group of a field
109801
multiplicative group of infinite fields