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In abstract algebra, a generating set of a group is a subset of the group set such that every element of the group can be expressed as a combination (under the group operation) of finitely many elements of the subset and their inverses. If G = ⟨S⟩, then we say that S generates G, and the elements in S are called generators or group generators. If S is the empty set, then ⟨S⟩ is the trivial group {e}, since we consider the empty product to be the identity.

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  • Generating set of a group (en)
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  • In abstract algebra, a generating set of a group is a subset of the group set such that every element of the group can be expressed as a combination (under the group operation) of finitely many elements of the subset and their inverses. If G = ⟨S⟩, then we say that S generates G, and the elements in S are called generators or group generators. If S is the empty set, then ⟨S⟩ is the trivial group {e}, since we consider the empty product to be the identity. (en)
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  • In abstract algebra, a generating set of a group is a subset of the group set such that every element of the group can be expressed as a combination (under the group operation) of finitely many elements of the subset and their inverses. In other words, if S is a subset of a group G, then ⟨S⟩, the subgroup generated by S, is the smallest subgroup of G containing every element of S, which is equal to the intersection over all subgroups containing the elements of S; equivalently, ⟨S⟩ is the subgroup of all elements of G that can be expressed as the finite product of elements in S and their inverses. (Note that inverses are only needed if the group is infinite; in a finite group, the inverse of an element can be expressed as a power of that element.) If G = ⟨S⟩, then we say that S generates G, and the elements in S are called generators or group generators. If S is the empty set, then ⟨S⟩ is the trivial group {e}, since we consider the empty product to be the identity. When there is only a single element x in S, ⟨S⟩ is usually written as ⟨x⟩. In this case, ⟨x⟩ is the cyclic subgroup of the powers of x, a cyclic group, and we say this group is generated by x. Equivalent to saying an element x generates a group is saying that ⟨x⟩ equals the entire group G. For finite groups, it is also equivalent to saying that x has order |G|. If G is a topological group then a subset S of G is called a set of topological generators if ⟨S⟩ is dense in G, i.e. the closure of ⟨S⟩ is the whole group G. (en)
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