Abstract
A group (G, ⋅ , e) is a set G of elements with a binary operation ⋅ , called the group operation, that together satisfy the four fundamental properties of closure (x ⋅ y ∈ G for any x, y ∈ G), associativity (x ⋅ (y ⋅ z) = (x ⋅ y) ⋅ z for any x, y, z ∈ G), the identity property (\(x \cdot e = e \cdot x = x\) for any x ∈ G), and the inverse property (for any x ∈ G, there exists an element x −1 ∈ G such that \(x \cdot x^{-1} = x^{-1} \cdot x = e\)).
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Deza, M.M., Deza, E. (2016). Distances in Algebra. In: Encyclopedia of Distances. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-52844-0_10
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DOI: https://doi.org/10.1007/978-3-662-52844-0_10
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