$\mathrm{Aut}(\mathbb Z_{11})$ is isomorphic to $\mathbb Z_{10}$.
40321
$\operatorname{Aut}(\mathbb Z_n)$ is isomorphic to $U_n$.
85752
Show that $M=\frac{\mathbb{Z}^3}{\langle (3,3,1),(2,2,2)\rangle}$ is isomorphic to $\mathbb{Z} \oplus \mathbb{Z}_4$ as $\mathbb{Z}$-modules
26661
Ring homomorphisms from $\mathbb{Z}_n$ to $\mathbb{Z}_m$
23879
If $m$ and $n$ are distinct positive integers, then $m\mathbb{Z}$ is not ring-isomorphic to $n\mathbb{Z}$
32302
Neukirch’s Number Theory – why is $ℂ \otimes_ℚ K → K_ℂ,~z \otimes a ↦ (j(z)a)_τ$ an isomorphism?
122312
How can I compute $\mathrm{Aut}(\mathbb{Z}/4\mathbb{Z}\times\mathbb{Z}/6\mathbb{Z})$?
148881
Aut(GxH) isomorphic to Aut(G)xAut(H)
11665
Show that $D_{12}$ is isomorphic to $D_6\times C_2$
137011
showing $\psi: R\to \mathbb C$ is ring isomorphism.
78118
Algebraically, why is $\mathbb{Z}[i]/(i + 1)$ isomorphic to $\mathbb{Z}_{2}$?
135241
Show that $\mathbb{Z}/n^2\mathbb{Z}$ is not isomorphic to other group
66169
Ring of order $n$ is isomorphic to $\Bbb Z/n\Bbb Z$, with $n$ square-free
55900
Is there a ring homomorphism $M_2(\mathbb Z)\to \mathbb Z$?
137739
Prove that the group isomorphism $\mathbb{Z}^m \cong \mathbb{Z}^n$ implies that $m = n$
157915
Isomorphism between the group $(\mathbb Z[x], +)$ and $(\mathbb Q_{>0}, .)$
3203
Quotient group $\mathbb Z^n/\ \text{im}(A)$
156909
$\Bbb{Z}_{26} \rtimes_{\alpha} \Bbb{Z}_{5} \cong \Bbb{Z}_{26} \times \Bbb{Z}_{5}$ as groups.