51Exx Finite geometry and special incidence structures

• 51E05 General block designs, See also {05B05}
• 51E10 Steiner systems
• 51E12 Generalized quadrangles, generalized polygons
• 51E14 Finite partial geometries (general), nets, partial spreads
• 51E15 Affine and projective planes
• 51E20 Combinatorial structures in finite projective spaces, See also {05Bxx}
• 51E21 Blocking sets, ovals, $k$-arcs
• 51E22 Linear codes and caps in Galois spaces, See also {94B05}
• 51E23 Spreads and packing problems
• 51E24 Buildings and the geometry of diagrams
• 51E25 Other finite nonlinear geometries
• 51E26 Other finite linear geometries
• 51E30 Other finite incidence structures, See also {05B30}
• 51E99 None of the above but in this section