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What is the relation between the classification of binary quadratic forms over $\mathbb Z$, and the problem of finding the class numbers of quadratic fields?

What would be a nice reference for this?

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    http://math.stackexchange.com/questions/192217/bijection-between-an-ideal-class-group-and-a-set-of-classes-of-binary-quadratic2012-10-09

3 Answers 3