Baer subset of projective plane

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This term is related to: incidence geometry
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A closed subset of a projective plane is termed a Baer subset if it satisfies the following two additional conditions:

  • Every point in the projective plane is incident with a line in the closed subset
  • Every line in the projcetive plane is incident with a point in the closed subset

Relation with other properties

Stronger properties

Weaker properties


  • Finite Geometries by Peter Dembowski, Chapter 3. Projective and affine planes