Covers of Point-Hyperplane Graphs
arXiv:math/0310322
Abstract
We construct a cover of the non-incident point-hyperplane graph of projective dimension 3 for fields of characteristic 2. If the cardinality of the field is larger than 2, we obtain an elementary construction of the non-split extension of SL_4 (F) by F^6.
10 pages, 3 figures