Is the relation $5$ divides $(x-y)$ an equivalence relation on $\mathbb Z$?
104987
Equivalence Relation with dividing x and y integers
16687
Number of Equivalence relations of $\{1,2,3\}$
19884
The units of $\mathbb Z_4[x]$
98963
Prove that neither $A$ nor $B$ is divisible by $5$
66020
What is $\mathbb Z[[t]]$? What are the double brackets?
33781
Is $\mathbb{Z}[x]/(x^2+1)$ isomorphic to $\mathbb{Z}[i]$?
139934
In $\mathbb{Z}/(n)$, does $(a) = (b)$ imply that $a$ and $b$ are associates?
40937
Is the set of partial order relations over $ \mathbb{N}$ countable?
63416
Prove $(n^5-n)$ is divisible by 5 by induction.
71977
Give an example of a relation R on $A^2$ which is reflexive, symmetric, and not transitive
2043
$X^n-Y^m$ is irreducible in $\Bbb{C}[X,Y]$ iff $\gcd(n,m)=1$
133636
Is $\mathbb Z[X]/(X^2-1)$ a domain?
35777
$\mathbb{R}[X,Y]/(Y-X^2,Y+X)\cong_\text{Ring} \mathbb{R}\times \mathbb{R}$
95141
$n^5-n$ is divisible by $10$?
80209
If $X,Y$ are equivalence relations, so is $X \times Y$
102112
Idempotents in $\mathbb Z_n$
54699
Product of pairwise coprime integers divides $b$ if each integer divides $b$