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Transactions of the American Mathematical Society

ISSN 1088-6850(online) ISSN 0002-9947(print)



Complex and integral laminated lattices

Authors: J. H. Conway and N. J. A. Sloane
Journal: Trans. Amer. Math. Soc. 280 (1983), 463-490
MSC: Primary 11H99; Secondary 52A43
MathSciNet review: 716832
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Abstract: In an earlier paper we studied real laminated lattices (or $ {\mathbf{Z}}$-modules) $ {\Lambda_n}$, where $ {\Lambda_1}$ is the lattice of even integers, and $ {\Lambda_n}$ is obtained by stacking layers of a suitable $ (n - 1)$-dimensional lattice $ {\Lambda_{n - 1}}$ as densely as possible, keeping the same minimal norm. The present paper considers two generalizations: (a) complex and quaternionic lattices, obtained by replacing $ {\mathbf{Z}}$-module by $ J$-module, where $ J$ may be the Eisenstein, Gaussian or Hurwitzian integers, etc., and (b) integral laminated lattices, in which $ {\Lambda_n}$ is required to be an integral lattice with the prescribed minimal norm. This enables us to give a partial answer to a question of J. G. Thompson on integral lattices, and to explain some of the computer-generated results of Plesken and Pohst on this problem. Also a number of familiar lattices now arise in a canonical way. For example the Coxeter-Todd lattice is the $ 6$-dimensional integral laminated lattice over $ {\mathbf{Z}}[ \omega ]$ of minimal norm $ 2$. The paper includes tables of the best real integral lattices in up to $ 24$ dimensions.

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Article copyright: © Copyright 1983 American Mathematical Society