Abstract
This chapter gives an account of the classification of integral quadratic forms. It is particularly designed for readers who wish to be able to do explicit calculations. Novel features include an elementary system of rational invariants (defined without using the Hilbert norm residue symbol), an improved notation for the genus of a form, an efficient way to compute the number of spinor genera in a genus, and some conditions which imply that there is only one class in a genus. We give tables of the binary forms with − 100 ⩽ det ⩽ 50, the indecomposable ternary forms with |det| ⩽ 50, the genera of forms with |det| ⩽ 11, the genera of p-elementary forms for all p, and the positive definite forms with determinant 2 up to dimension 18 and determinant 3 up to dimension 17.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Rights and permissions
Copyright information
© 1993 Springer Science+Business Media New York
About this chapter
Cite this chapter
Conway, J.H., Sloane, N.J.A. (1993). On the Classification of Integral Quadratic Forms. In: Sphere Packings, Lattices and Groups. Grundlehren der mathematischen Wissenschaften, vol 290. Springer, New York, NY. https://doi.org/10.1007/978-1-4757-2249-9_15
Download citation
DOI: https://doi.org/10.1007/978-1-4757-2249-9_15
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4757-2251-2
Online ISBN: 978-1-4757-2249-9
eBook Packages: Springer Book Archive