A relation between a group and its subgroups
72150
Union of the conjugates of a proper subgroup
80381
Groups with "few" subgroups
90081
problems in group theory
114811
Characteristic subgroups and automorphisms
155502
Index of a maximal subgroup in a finite group
97928
Normal subgroup of a normal subgroup
151210
How can we find and categorize the subgroups of $\mathbb{R}$?
12667
How many subgroups of order $n$ does $D_n$ have?
24966
Converse of Lagrange's theorem for abelian groups
30236
isomorphic groups related in direct product.
44165
the image of normal subgroups
39938
Subgroups of a cyclic group and their order.
68422
Understanding Lagrange's Theorem (Group Theory)
26256
Characterizing Dense Subgroups of the Reals
33868
A transformation between two free group actions.
42449
Is there any efficient algorithm for finding subgroups of a given finite group?
128652
Subgroups of $\mathbb Z \times(\mathbb Z/n\mathbb Z)$