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Let a Module in an Integral Domain
for
be expressed using a two-element basis as
For Imaginary Quadratic Fields
(with
), the
discriminants are given in the following table.
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The discriminants of Real Quadratic Fields
(
) are
given in the following table.
2 | ![]() |
34 | ![]() |
67 | ![]() |
3 | ![]() |
35 |
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69 | ![]() |
5 | 5 | 37 | 37 | 70 |
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6 | ![]() |
38 | ![]() |
71 | ![]() |
7 | ![]() |
39 |
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73 | 73 |
10 | ![]() |
41 | 41 | 74 | ![]() |
11 | ![]() |
42 |
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77 | ![]() |
13 | 13 | 43 | ![]() |
78 |
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14 | ![]() |
46 | ![]() |
79 | ![]() |
15 |
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47 | ![]() |
82 | ![]() |
17 | 17 | 51 |
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83 | ![]() |
19 | ![]() |
53 | 53 | 85 | ![]() |
21 | ![]() |
55 |
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86 | ![]() |
22 | ![]() |
57 | ![]() |
87 |
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23 | ![]() |
58 | ![]() |
89 | 89 |
26 | ![]() |
59 | ![]() |
91 |
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29 | 29 | 61 | 61 | 93 | ![]() |
30 |
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62 | ![]() |
94 | ![]() |
31 | ![]() |
65 | ![]() |
95 |
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33 | ![]() |
66 |
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97 | 97 |
See also Different, Fundamental Discriminant, Module
References
Cohn, H. Advanced Number Theory. New York: Dover, pp. 72-73 and 261-274, 1980.
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© 1996-9 Eric W. Weisstein