51Dxx Geometric closure systems ( 0 Dok. )

• 51D05 Abstract (Maeda) geometries ( 0 Dok. )
• 51D10 Abstract geometries with exchange axiom ( 0 Dok. )
• 51D15 Abstract geometries with parallelism ( 0 Dok. )
• 51D20 Combinatorial geometries, See also {05B25, 05B35} ( 0 Dok. )
• 51D25 Lattices of subspaces, See also {05B35} ( 0 Dok. )
• 51D30 Continuous geometries and related topics, See also {06Cxx} ( 0 Dok. )
• 51D99 None of the above but in this section ( 0 Dok. )