Order of $\mathbb{Z}[i]/(1+i)$
6121
Quotient ring of Gaussian integers
69582
Is it true that: $a+bi$ is prime in $\mathbb{Z}[i]$ if and only if $a^2+b^2$ is prime in $\mathbb{Z}$
127233
Cardinality of order types in $\mathbb{N}$
62977
Show on $\mathbb{N}$ there are $2^{\aleph_0}$ nonisomorphic linear orders.
1577
Order of nontrivial elements is 2 implies Abelian group
138258
What is the injective envelope of $\mathbb{Z}/n\mathbb{Z}$?
59134
Proving idempotent elements in $\mathbb{Z}_n$
84823
When is the group of units in $\mathbb{Z}_n$ cyclic?
46687
Elements of $GL_{2}(\mathbb{Z})$ of finite order
58925
Order of general linear group of $2 \times 2$ matrices over $\mathbb{Z}_3$
95081
Ordering on complex numbers
7843
Show that order of $a^k$
104513
Order of elements in $Z_n$
83654
Order of an element in a finite cyclic group
4103
Total ordering on complex numbers
93703
Groups of units of $\mathbb{Z}\left[\frac{1+\sqrt{-3}}{2}\right]$
98587
$\mathbb Z [X] / (X)$ isomorphic to $\mathbb Z[X] / (X+1)$ isomorphic to $\mathbb Z [X] / (X+2015)$