A characterization of the sets of internal and external points of a conic

@article{Clerck2007ACO,
  title={A characterization of the sets of internal and external points of a conic},
  author={Frank De Clerck and N. De Feyter},
  journal={Eur. J. Comb.},
  year={2007},
  volume={28},
  pages={1910-1921}
}
We provide a characterization of the sets of internal and external points of a nondegenerate conic in the plane PG(2,q), q odd, by means of their pattern of intersection with lines. In fact, we classify all sets of class [0,12(q-1),12(q+1),q] in PG(2,q), q odd. 

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