Abstract

We characterize the minimum size blocking sets with respect to the external lines to a non-singular quadric or a quadric with a point vertex in PG($d,q$), $d\ge 4$ and $q\ge 9$. Our results show that these minimum size blocking sets are equal to the sets of points not on the quadric in a suitably chosen hyperplane with respect to the quadric.

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Mathematical Subject Classification 2000

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