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Mathematical Sciences Classification System

51Dxx - Geometric closure systems

• 51D05
  Abstract (Maeda) geometries
• 51D10
  Abstract geometries with exchange axiom
• 51D15
  Abstract geometries with parallelism
• 1
  51D20
  Combinatorial geometries [See also 05B25, 05B35]
• 51D25
  Lattices of subspaces [See also 05B35]
• 51D30
  Continuous geometries and related topics [See also 06Cxx]
• 51D99
  None of the above, but in this section