Commutative

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Two elements x and y of a set S are said to be commutative under a binary operation * if they satisfy

 x*y=y*x.
(1)

Real numbers are commutative under addition

 x+y=y+x
(2)

and multiplication

 x·y=y·x.
(3)

The Wolfram Language attribute that sets a function to be commutative is Orderless.

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