Abstract
For the benefit of less experienced readers, we repeat some basic definitions of abstract algebra. A group is a pair (G, + G ) in which G is a set and + G is a closed associative binary operation on G for which the following hold:
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a)
there exists an element 1 G of G, called the identity, which has the property that for any element a in G, we have a + G 1 G = 1 G + G a = a;
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b)
b) for every element a of G, there exists an element b, called the inverse of a, for which a + G b = b + G a = 1 G .
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© 1989 Springer-Verlag New York Inc.
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Buell, D.A. (1989). Quadratic Number Fields. In: Binary Quadratic Forms. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4542-1_6
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DOI: https://doi.org/10.1007/978-1-4612-4542-1_6
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-8870-1
Online ISBN: 978-1-4612-4542-1
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