Isomorphism theorem: $\mathbb{Z}[i]/(i+4) \to \mathbb{Z}/17\mathbb{Z}$
66313
$\mathbb{Z}[i]/(a+bi) \cong \mathbb{Z}_{a^2+b^2}$ if $(a,b)=1$
5996
Are $(\mathbb{R},+)$ and $(\mathbb{C},+)$ isomorphic as additive groups?
34424
Determining ring of integers for $\mathbb{Q}[\sqrt{17}]$
53331
$\mathbb{Q}(\sqrt2, \sqrt3)$ is not isomorphic to $\mathbb{Q}(\sqrt[4]2)$
36142
What is $\mathbb Z \oplus \mathbb Z / \langle (2,2) \rangle$ isomorphic to?
99032
Prove that the additive group of $\mathbb{Z}[x]$ is isomorphic to the group of positive rational numbers under multiplication.
18540
Isomorphism from $\mathbb{C}[G]$ to $\prod_{i=1}^h M_{n_i}(\mathbb{C})$.
108156
Algebraic closure of $\mathbb{C}(x)$ is isomorphic to $\mathbb{C}$
37351
Group of Order $p^2$ Isomorphic to $\mathbb{Z}_{p^2}$ or $\mathbb{Z}_{p}$ $\times$ $\mathbb{Z}_{p}$
154847
homomorphism from $S_3$ to $\mathbb Z/3\mathbb Z$
119160
Isomorphism between complex numbers minus zero and unit circle
55393
Existence of a group isomorphism between $(\mathbb K,+)$ and $(\mathbb K^\times,\cdot)$
138258
What is the injective envelope of $\mathbb{Z}/n\mathbb{Z}$?
150204
Isomorphisms between the groups $U(10), U(5)$ and $\mathbb{Z}/4\mathbb{Z}$
77903
Finding the integral closure of $\mathbb{Z}$ in $\mathbb{Q}[i]$
34599
Number of ring homomorphisms from $\mathbb Z_{12}$ to $\mathbb Z_{28}$.
18018
Proving that $4 \mid m - n$ is an equivalence relation on $\mathbb{Z}$