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Normal Forms for Definite Integer Unimodular Quadratic Forms
Proceedings of the American Mathematical Society
Vol. 106, No. 4 (Aug., 1989), pp. 917-921
Published by: American Mathematical Society
Stable URL: http://www.jstor.org/stable/2047275
Page Count: 5
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In this paper we show that any two positive definite integer unimodular quadratic forms have a common sublattice of codimension 2. Moreover, any such form is equivalent to a semi-normal form with at most three eigenvalues different from 1.
Proceedings of the American Mathematical Society © 1989 American Mathematical Society