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Partial covers of PG(n,q)

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arxiv 1210.1002 v1 pith:S7AI42PK submitted 2012-10-03 math.CO

Stefan Dodunekov , Leo Storme , Geertrui Van de Voorde This is my paper · ORCID
classification math.CO
keywords boundpointscoversharpblokhuisbrouwercontainedcovered
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In this paper, we show that a set of q+a hyperplanes, q>13, a<(q-10)/4, that does not cover PG(n,q), does not cover at least q^(n-1)-aq^(n-2) points, and show that this lower bound is sharp. If the number of non- covered points is at most q^(n-1), then we show that all non-covered points are contained in one hyperplane. Finally, using a recent result of Blokhuis, Brouwer, and Szonyi [3], we remark that the bound on a for which these results are valid can be improved to a<(q-2)/3 and that this upper bound on a is sharp

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