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invariants. A form of discriminant is definite if , degenerate if is a perfect square, and indefinite otherwise. A form is primitive if its content is 1, that is, if its coefficients are coprime. If a form's discriminant is a fundamental discriminant, then the form is primitive. Discriminants satisfy

Automorphisms

If f is a quadratic form, a matrix

:

in is an automorphism of f if . For example, the matrix

:

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