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Math Help - Looking for results of quadratic forms

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    Looking for results of quadratic forms

    Hey, Im currently studying binary quadratic forms. Im looking for good resources or books to look for some results. In particular im searching for proofs about class numbers of discriminants. Anyone has any references?
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    Quote Originally Posted by EinStone View Post
    Hey, Im currently studying binary quadratic forms. Im looking for good resources or books to look for some results. In particular im searching for proofs about class numbers of discriminants. Anyone has any references?
    If you want to study class number theory, I suggest going at it through Galois theory (i.e. through algebraic number theory) and not through Gauss' theory of binary quadratic forms. The two theories are equivalent on some level, but the first approach is more modern and lends itself better to generalization. There are many good books on algebraic number theory.

    If you want to study quadratic forms in a general setting, I suggest Serre's book A Course in Arithmetic, which is really a classic. It's a tiny book, very dense, and written in the most elegant fashion. In this book, Serre classifies quadratic forms over the rationals and over the P-adic fields. The book also contains modern proofs of classical results concerning the representations of integers by quadratic forms. (The scope of the book is much wider than quadratic forms, however - that's only one chapter!)
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