On the Phan system of the Schur cover of SU(4, 32)
نویسنده
چکیده
This article is part of the program described in [3]. We study the Phan amalgams and their universal completions that occur for q = 3 in rank n = 3 for the diagram A3 = D3, corresponding to SU(4, 3) ∼= Spin−(6, 3). We show that the associated geometries admit universal 9-fold coverings, by showing that the universal completion of the Phan amalgam is the central extension of SU(4, 3) by its Schur multiplier. This information provides the last missing piece of information in the full classification of Phan amalgams and their universal completions for An and Dn.
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ورودعنوان ژورنال:
- Des. Codes Cryptography
دوره 47 شماره
صفحات -
تاریخ انتشار 2008