What is $\mbox{Hom}(\mathbb{Z}/2,\mathbb{Z}/n)$?
136804
Computing $\mathrm{Hom}(\mathbb Z_n,\mathbb Z_m)$ as $\mathbb Z$-module
1712
$ d_1,d_2\mid n\iff {\rm lcm}(d_1,d_2)\mid n\ $ [LCM Universal Property]
141984
Find the number of homomorphisms between $\mathbb{Z}_m$ and $\mathbb{Z}_n$
57434
$SL_2(\mathbb Z_3)/Z(SL_2(\mathbb Z_3)) \cong A_4$
12110
How are $2\mathbb{Z}\ncong3\mathbb{Z}$ different as rings?
137422
$\mathrm{card}(\mathbb{Z}^n/M\mathbb{Z}^n) = |\det(M)|$?
50412
Prime elements in $\mathbb{Z}/n\mathbb{Z}$
18018
Proving that $4 \mid m - n$ is an equivalence relation on $\mathbb{Z}$
2235
Showing $\text{Aut}_\mathsf{Grp}(\mathbb{Z}/2\mathbb{Z} \times \mathbb{Z}/2\mathbb{Z}) \cong S_3$
98587
$\mathbb Z [X] / (X)$ isomorphic to $\mathbb Z[X] / (X+1)$ isomorphic to $\mathbb Z [X] / (X+2015)$
38549
$\mathbb{Q}(\sqrt{n}) \cong \mathbb{Q}(\sqrt{m})$ iff $n=m$
122312
How can I compute $\mathrm{Aut}(\mathbb{Z}/4\mathbb{Z}\times\mathbb{Z}/6\mathbb{Z})$?
8434
Order of $\mathbb{Z}[i]/(1+i)$
33338
Problem on $\operatorname{Hom}(\mathbb Z_6,R^*\oplus C^*)$
82571
Number of solutions of $x^2=1$ in $\mathbb{Z}/n\mathbb{Z}$
138258
What is the injective envelope of $\mathbb{Z}/n\mathbb{Z}$?
108775
Identify the ring $\mathbb {Z}[i]/(2 + i) $