Integers form Commutative Ring with Unity

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Theorem

The integers $\left({\Z, +, \times}\right)$ form a commutative ring with unity under addition and multiplication.


Proof

We have that:

$\left({\Z, +, \times}\right)$ form a commutative ring.
$\left({\Z, +, \times}\right)$ has a unity, and the unity is $1$.

$\blacksquare$


Sources