Generators of Additive Group of Integers

Theorem
The only generators of the additive group of integers $\left({\Z, +}\right)$ are $1$ and $-1$.

Proof
From Integers Infinite Cyclic Group, $\left({\Z, +}\right)$ is an infinite cyclic group generated by $1$.

From Generators of Infinite Cyclic Group, there is only one other generator of such a group, and that is the inverse of that generator.

The result follows.