group whose group operation is commutative From Wikipedia, the free encyclopedia
In group theory, an abelian group is a group with operation that is commutative. Because of that, an abelian group is sometimes called a ‘commutative group’.
A group in which the group operation is not commutative is called a ‘non-abelian group’ or ‘non-commutative group’.
An abelian group is a set, A, together with an operation "•". It combines any two elements a and b to form another element denoted a • b. For the group to be abelian, the operation and the elements (A, •) must follow some requirements. These are known as the abelian group axioms:
One example of an abelian group is the set of the integers with the operation of addition. We often write this as , where means the set of all integers. This is an abelian group because is a group, and also for any integers and , the equation is true. For example, , because both sides are equal to .
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