$\Bbb{Z}/10\Bbb{Z}$ isomorphic to $\Bbb{Z}[i]/\langle 1+3i\rangle$.
6121
Quotient ring of Gaussian integers
93169
Show that $(\mathbb Z[x],+)$ and $(\mathbb Q_{>0},\cdot)$ are isomorphic groups
157915
Isomorphism between the group $(\mathbb Z[x], +)$ and $(\mathbb Q_{>0}, .)$
43230
Is $\langle1-i\rangle$ a maximal ideal in $\mathbb{Z}[i]$?
78263
Prove $GL_n(\Bbb{R})/SL_n(\Bbb{R}) \cong \Bbb{R}^\times$
146969
Proving that every group of order $4$ is isomorphic to $\Bbb Z_4$ or $\Bbb Z^*_8$
50130
$\operatorname{Aut}(V)$ is isomorphic to $S_3$
98284
show $\Bbb Z_6 \cong \Bbb Z_3 \times \Bbb Z_2 $.
33177
All numbers of form $10^{k} + 1$ are composite for $k{\gt}2$ proof
132725
Is $\mathbb{Z}/\langle n\rangle$ cyclic and of order $n$?
94579
$\mathbb{Q}[x,y]/\langle x^2+y^2-1 \rangle$ is an integral domain, and its field of fractions is isomorphic to $\mathbb Q(t)$
61732
Prove any group with 3 elements is isomorphic to $\mathbb{Z}_3$
121449
An isomorphism from $GL_{2}(\mathbb{F_{2}})$ to $S_{3}$
156909
$\Bbb{Z}_{26} \rtimes_{\alpha} \Bbb{Z}_{5} \cong \Bbb{Z}_{26} \times \Bbb{Z}_{5}$ as groups.
32278
Adjoining 1/2 to $\Bbb{Z}/12\Bbb{Z}$
98507
$\text{Aut}(F)$ is isomorphic to the multiplicative group of all $n\times n$ matrices over $\mathbb Z$
146028
$GL(n, \mathbb{C})$ is isomorphic to a subgroup of $GL(2n, \mathbb{R})$