Group isomorphism between rationals with sum and rationals with multiplication
86542
Group of positive rationals under multiplication not isomorphic to group of rationals
55393
Existence of a group isomorphism between $(\mathbb K,+)$ and $(\mathbb K^\times,\cdot)$
120968
Isomorphism of stabilizer over $S_n$ to $S_{n-1}$
33138
Is Rational number under multiplication group?
52556
Isomorphism of $S^1$.
51695
Finding all homomorphisms between $\mathbb{Z}/m\mathbb{Z}$ and $\mathbb{Z}/n\mathbb{Z}$
73652
Exhibiting an isomorphism between two finite fields
25744
Multiplication in Permutation Groups Written in Cyclic Notation
90433
Isomorphisms between $(\mathbb Z_4,+)$ and $(U_5,*)$
157915
Isomorphism between the group $(\mathbb Z[x], +)$ and $(\mathbb Q_{>0}, .)$
151047
a non trivial example: $G/H$ is isomorphic to $G$
5906
All group homomorphism from $ \mathbb{Z} _m $ to $\mathbb{Z}_n $
126790
Basic Isomorphism Question
120035
Pattern in Isomorphisms between $\mathbb Z_m \times \mathbb Z_n$ and $\mathbb Z_{mn}$
143451
Homomorphism from $(\Bbb Q,+)$ to a finite group
146278
Automorphism group of direct product of groups
136422
Two finite fields with the same number of elements are isomorphic