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Commutative property
In mathematics, a binary operation is commutative if changing the order of the operands does not change the result. It is a fundamental property of many binary operations, and many mathematical proofs depend on it. Most familiar as the name of the property that says or , the property can also be used in more advanced settings. The name is needed because there are operations, such as division and subtraction, that do not have it (for example, ), such operations are ''not'' commutative, or ''noncommutative operations''. The idea that simple operations, such as multiplication and addition of numbers, are commutative was for many years implicitly assumed and the property was not named until the 19th century when mathematics started to become formalized.
==Common uses==
The ''commutative property'' (or ''commutative law'') is a property generally associated with binary operations and functions. If the commutative property holds for a pair of elements under a certain binary operation then the two elements are said to ''commute'' under that operation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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