Finding Bijection between subgroups of group $G = NU$.
13453
Bijection map from a set of subgroup to another set of subgroup under some condition.
41231
Subgroups of (Z,+) of order n
24181
Showing that $G$ is a group under an alternative operation.
57809
For which $n$, $G$ is abelian?
146760
Prove that H is a subgroup of G
128443
Isomorphism between finite groups
131516
Subgroup generated by n-th powers of elements
141265
Finding a normal and not normal subgroup of $S_3$
43651
Normal subgroups and factor groups
98739
If $H$ is a subgroup of $G$ and $K$ is a subgroup of $H$, then $$|G:K|=|G:H||H:K|$$
151210
How can we find and categorize the subgroups of $\mathbb{R}$?
12667
How many subgroups of order $n$ does $D_n$ have?
31391
bijection between $\mathbb{N}$ and $\mathbb{N}\times\mathbb{N}$
10458
How to define a bijection between $(0,1)$ and $(0,1]$?
82003
Bijection between sets of ideals
97928
Normal subgroup of a normal subgroup
39938
Subgroups of a cyclic group and their order.