51Dxx Geometric closure systems
- 51D05 Abstract (Maeda) geometries
- 51D10 Abstract geometries with exchange axiom
- 51D15 Abstract geometries with parallelism
- 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
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