Programmed Math/Commutative

An operation is commutitive if and only if the order does not affect the result.

For example, addition is commutitive for the real numbers; thus, if $$a, b$$ are both real:

$$a + b = b + a$$

An operation that is not commutative is subtraction over the reals; ie, the following is not true:

$$a - b = b - a$$