Are the groups $(\Bbb Q^2,+)$ and $(\Bbb Q,+)$ isomorphic?
42810
Is $(\mathbb{Q},+)$ isomorphic to $(\mathbb{Q}^n,+)$?
100439
Proving that a Galois group $Gal(E/Q)$ is isomorphic to $\mathbb{F}_p^\times$
151862
Is any subgroup of a direct product isomorphic to a direct product of subgroups?
84869
Are the groups $\mathbb{C}$ and $\mathbb{R}$ isomorphic?
69384
Are the following modules free and/or isomorphic?
89415
Number of homomorphisms from $(\mathbb Q^+ , \,\cdot\,)$ to $(\mathbb Z_n , +)$
65968
Prove that any two cyclic groups of the same order are isomorphic?
113413
How do I show that two groups are not isomorphic?
30753
Showing there is no ring whose additive group is isomorphic to $\mathbb{Q}/\mathbb{Z}$
84114
Does there exist a surjective homomorphism from $(\mathbb R,+)$ to $(\mathbb Q,+)$ ?
58009
How to show that $\mathbb Q(\sqrt 2)$ is not field isomorphic to $\mathbb Q(\sqrt 3).$
41069
Justifying $\,\Bbb{Z}[i]/\langle 2\rangle\cong \Bbb{Z}[X]/\langle X^2+1,2\rangle\cong \Bbb{F}_2[X]/\langle X^2+1\rangle$
93017
Isomorphism between $\Bbb R$ and $\Bbb R(X)$?
33455
Question on group homomorphisms involving the standard Z-basis
126098
Isomorphism of factor groups
87160
Prove $\mathbb{Z}_3[x]/(x^2+1)$ and $\mathbb{Z}_3[x]/(x^2+x-1)$ are isomorphic.
99538
Non-trivial groups pairwise non-isomorphic with isomorphic direct products