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Abelian group
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In group theory, an abelian group is a group that is commutative.
Definition
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:
 Closure
 For all a, b in A, the result of the operation a • b is also in A.
 Associativity
 For all a, b and c in A, the equation (a • b) • c = a • (b • c) is true.
 Identity element
 There exists an element e in A, such that for all elements a in A, the equation e • a = a • e = a holds.
 Inverse element
 For each a in A, there exists an element b in A such that a • b = b • a = e, where e is the identity element.
 Commutativity
 For all a, b in A, a • b = b • a.
An abelian group is a commutative group. A group in which the group operation is not commutative is called a "nonabelian group" or "noncommutative group".
