Integer Divisor Results/One Divides all Integers

Theorem
Let $n \in \Z$, i.e. let $n$ be an integer.

Then:

That is, $1$ divides $n$, and $-1$ divides $n$.

Proof
As the set of integers form an integral domain, the concept divides is fully applicable to the integers.

Therefore this result follows directly from Unity Divides All Elements.