Finite cyclic subgroups of $GL_{2} (\mathbb{Z})$
75553
Order of matrices in $GL_2(\mathbb{Z})$
118894
Cyclic subgroup of dihedral group
48585
Proving that if $G/Z(G)$ is cyclic, then $G$ is abelian
119758
On the order of elements of $\mathrm{GL}(2,q)$.
57309
Show that the free group on $n$ generators is a finite index subgroup of $F_2$
28210
A finite group with exactly $2$ conjugacy classes isomorphic to $\mathbb{Z}_2$
94296
Classifying the factor group $(\mathbb{Z} \times \mathbb{Z})/\langle (2, 2) \rangle$
68201
Cyclic group of order $n$
94239
Proof that if group $G/Z(G)$ is cyclic, then $G$ is commutative
154241
What is the easiest way to generate $\mathrm{GL}(n,\mathbb Z)$?
7967
Prove that the order of the cyclic subgroup $\langle g^k\rangle $ is $n/{\operatorname{gcd}(n,k)}$
45727
If $G$ contains a normal subgroup $H \cong \mathbb{Z_2}$ such that $G/H$ is infinite cyclic, then $G \cong \mathbb{Z} \times \mathbb{Z_2}$
98474
Show the existence of a certain subgroup of F2
149578
Subgroups of $(\mathbb Z_n,+)$
150207
Non isomorphic subgroups of cyclic groups
142894
Showing that a group of order $pq$ is cyclic if it has normal subgroups of order $p$ and $q$
156154
Sylow 2 subgroups of S4