Subgroup of square generators.
4883
Let $H$ be a subgroup of a group $G$ such that $x^2 \in H$ , $\forall x\in G$ . Prove that $H$ is a normal subgroup of $G$
48393
Abelian groups of order n.
133770
Subgroups of finite abelian groups.
154398
Show that H is a subgroup of G
82843
Subgroups of $\Bbb{R}^n$ that are closed and discrete
18181
Complete classification of the groups for which converse of Lagrange's Theorem holds
115969
Amount of generators for cyclic group and Euler's function
128899
How to find all generators for a cyclic group of order $n$?
2767
Subgroups of the Klein-4 Group
3317
Subgroup generated by $2$ and $7$ in $(\mathbb Z,+)$
11957
G is the product of its Sylow subgroups
76504
Non-trivial cyclic group with unique generator
36709
subgroup of direct product of two groups
41231
Subgroups of (Z,+) of order n
143314
Sylow subgroup of $S_{p^2}$
72048
Finding Sylow 2-subgroups of the dihedral group $D_n$
73113
Groups and Symmetries