Subgroups of given index of a finitely generated group
110708
On proving that a finitely generated group has a finite number of subgroups with index $n$.
98474
Show the existence of a certain subgroup of F2
103002
Group equals union of two subgroups
133001
$G$ simple group and there exists a subgroup of index $n$. Show that: $|G|$ divides $n!/2$
61064
Finite index subgroup $G$ of $\mathbb{Z}_p$ is open.
88344
Order of a group and subsequent subgroups
36709
subgroup of direct product of two groups
106277
Prove that $G$ contains a subgroup $H_i$ for each $i\in\Bbb Z$ with $\dots\subset H_{−2}\subset H_{−1}\subset H_0\subset H_1\subset\dots?$
48369
discrete subgroups of euclidean space
75568
Subgroup of index $2$ is Normal
139835
Every Finite Group is Isomorphic to a Subgroup of $A_n$
64582
Group covered by finitely many cosets
72150
Union of the conjugates of a proper subgroup
74044
Find all subgroups of $\mathbb{Z}\times\mathbb{Z}$.
121587
Let $H$ be a normal subgroup of index $n$ in a group $G$. Show that for all $g \in G, g^n \in H$
87534
Finitely generated group which is not finitely presented
42449
Is there any efficient algorithm for finding subgroups of a given finite group?