“Simple” practice involves an application of the commutative law.
Often the meaning of a sentence tacitly implies that the commutative law does not hold.
Negative Numbers may be regarded as resulting from the commutative law for addition and subtraction.
in mathematics, a law stating that the order of the terms or factors is irrelevant in combining or multiplying quantities in algebra or arithmetic
Commutative law says that changing the order does not change the result.