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On the Dirichlet—Voronoi cell of unimodular lattices

✍ Scribed by Ákos G. Horváth


Publisher
Springer
Year
1996
Tongue
English
Weight
448 KB
Volume
63
Category
Article
ISSN
0046-5755

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✦ Synopsis


This paper consists of two results concerning the Dirichlet-Voronoi cell of a lattice. The first one is a geometric property of the cell of an integral unimodular lattice while the second one gives a characterization of all those lattice vectors of an arbitrary lattice whose multiples by ½ are on the boundary of the cell containing the origin. This result is a generalization of a well-known theorem of Voronoi characterizing the so-called relevants of the cell.


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It is shown that an n-dimensional unimodular lattice has minimal norm at most 2[nÂ24]+2, unless n=23 when the bound must be increased by 1. This result was previously known only for even unimodular lattices. Quebbemann had extended the bound for even unimodular lattices to strongly N-modular even la