Discrete Math - If two natural numbers divide each other, then they are equal
46286
Prove if $a\mid b$ and $b\mid a$, then $|a|=|b|$ , $a, b$ are integers.
95181
If the sum of two irreducible fractions is an integer, then the denominators are equal
151434
If integers $a$ and $b$ are not both zero, then $\gcd(a,b)=\gcd(a-b,b)$
139505
Peano/Presburger axioms - "find" numbers lower or equal than another number
121469
Proof of observations on natural numbers being expressed as differences of squares.
68092
Does square difference prove that 1 = 2?
115264
Find when three numbers have the same remainder when divided by the same number
74631
For natural numbers $a$ and $b$, show that $a \Bbb Z + b \Bbb Z = \gcd(a, b)\Bbb Z $
129693
An interesting problem with "decomposing" natural numbers.
31937
How do I prove equality of x and y?
57938
When do two functions become equal?
13688
Why are these numbers not equal?
63183
Suppose $a,b,m,n$ are natural numbers, prove that if $a({m \over n})=b$ and $(a,n)=1$, then ${m \over n} \in \mathbb{N}$
96169
$n$ divides a product of $n$ consecutive integers (by $n$ divides one of them)
33866
Show that $n$ does not divide $2^n - 1$ where $n$ is an integer greater than $1$?
104987
Equivalence Relation with dividing x and y integers
11470
Divisibility of integers