The genus of the Barnes-Wall lattice
The genus of the Barnes-Wall lattice
复制标题
巴恩斯-沃尔格子的亏格
DOI:
10.1007/bf02564490
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发表时间:
1994
影响因子:
0.9
通讯作者:
B. Venkov
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作者:
Rudolf Scharlau;B. Venkov
In this paper, we combine the general concept of the root system of a Euclidean lattice as studied in BS] with the\main lemma" Proposition 1 of Ve] to obtain the full classi cation of all 2-elementary totally even 16-dimensional lattices of determinant 28. It turns out that this genus of lattices consists of 24 isometry classes. Like in the case of 24-dimensional, even unimodular lattices, 23 of them are re ective in the sense that the root system has maximal rank 16. We derive a list ofpossible'root systems, which are subject to two essential restrictions. It turns out that for each root system in our list, there exists a unique lattice. Acknowledgement. Most of this work was done during a stay of the second author at the Sonderforschungsbereich 343 of the Faculty of Mathematics, University of Bielefeld, in November and December 1992. B. Venkov thanks this institution for its hospitality. R. Scharlau's thanks go to the Max-Planck-Institut for Mathematik, Bonn, for a short invitation in May 1993 which allowed him to nish this work. Both authors are indebted to H.-G. Quebbemann for his interest and advice.
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