Integer Multiples form Commutative Ring/Examples

Examples of Use of Integer Multiples form Commutative Ring

Even Integers form Commutative Ring

Let $2 \Z$ be the set of even integers.

Then $\struct {2 \Z, +, \times}$ is a commutative ring.

However, $\struct {2 \Z, +, \times}$ is not an integral domain.