Independent of order. Used of a logical or mathematical operation that combines objects or sets of objects two at a time. If a b= b a,the operation indicated by is commutative.
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- 交换的次序的独立。用于一次联接两个或两组对象的逻辑或数学操作。如果a祝絙祝?勺表示的操作是可交换担D