Subgroups of $\mathbb{R}^n$ isomorphic to integer lattices
48369
discrete subgroups of euclidean space
101345
Suppose $n$ is an even positive integer and $H$ is a subgroup of $\mathbb Z/n \mathbb Z$. Prove that either every element of $H$ is...
82474
Isometries of $\mathbb{R}^n$
133770
Subgroups of finite abelian groups.
50731
Isometries of the sphere $\mathbb{S}^{n}$
51352
Subgroups of a finite abelian group
26661
Ring homomorphisms from $\mathbb{Z}_n$ to $\mathbb{Z}_m$
88645
Prove that the additive groups $\mathbb{R}$ and $\mathbb{Q}$ are not isomorphic.
59138
Subgroups of $S_4$ isomorpic to $S_2$
28576
Galois Groups are isomorphic to subgroups of symmetric groups.
146028
$GL(n, \mathbb{C})$ is isomorphic to a subgroup of $GL(2n, \mathbb{R})$
64269
Finding the minimal $n$ such that a given finite group $G$ is a subgroup of $S_n$
68955
Characterising subgroups of Prüfer $p$-groups.
45770
Does the order, lattice of subgroups, and lattice of factor groups, uniquely determine a group up to isomorphism?
90511
Commutator subgroup of a dihedral group.
83001
Easier way to show $(\mathbb{Z}/(n))[x]$ and $\mathbb{Z}[x] / (n)$ are isomorphic
5996
Are $(\mathbb{R},+)$ and $(\mathbb{C},+)$ isomorphic as additive groups?