Find elements of a group $\operatorname{Aut}(\mathbb{Z_{20}})$ automorphisms of cyclic group $\mathbb{Z_{20}}$
126089
Showing $U(20)$ is not cyclic: Is my proof correct?
158074
Cyclic group $G$ with generator $ab$.
39938
Subgroups of a cyclic group and their order.
101602
consider the group $G=\mathbb Q/\mathbb Z$. For $n>0$, is there a cyclic subgroup of order n
151559
Please help: How to show that Aut(G) is a subgroup of Sym(G)
148881
Aut(GxH) isomorphic to Aut(G)xAut(H)
132725
Is $\mathbb{Z}/\langle n\rangle$ cyclic and of order $n$?
69361
How do you find the automorphism?
126771
Group element not taken to its inverse by any automorphism
61394
The product of finitely many cyclic groups is cyclic
156549
Prove that there is no group $G$ s.t. $\operatorname{Aut}(G)=\mathbb{Q}$
13355
Product of elements of a finite abelian group
105103
Automorphism from $\Bbb Q$ to $\Bbb Q$
7890
Prove the map $\Phi:G\to\operatorname{Aut}G$ with $g\mapsto (x\mapsto g^{-1}xg)$ is an homomorphism.
146278
Automorphism group of direct product of groups
9140
Show $\operatorname{Aut}(C_2 \times C_2)$ is isomorphic to $S_3=D_6$
7967
Prove that the order of the cyclic subgroup $\langle g^k\rangle $ is $n/{\operatorname{gcd}(n,k)}$