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Results tagged with quadratic-forms
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user 9317
Algebraic and geometric theory of quadratic forms and symmetric bilinear forms, e.g., values attained by quadratic forms, isotropic subspaces, the Witt ring, invariants of quadratic forms, the discriminant and Clifford algebra of a quadratic form, Pfister forms, automorphisms of quadratic forms.
20
votes
3
answers
2k
views
Primes of the form $x^2+ny^2+mz^2$ and congruences.
This is a sequel of this question where I asked for which positive integer $n$ the
set of primes of the former $x^2+ny^2$ was defined by congruences (a set of primes $P$ is defined by congruences if t …
- 26k
15
votes
2
answers
2k
views
Primes and $x^2+2y^2+4z^2$
A few months ago, I have asked a question about primes represented by ternary quadratic forms. I got two wonderful answers, which showed me how the theory was way richer and more complex that I naivel …
- 26k