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
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