51Axx Linear incidence geometry
- 51A05 General theory and projective geometries
- 51A10 Homomorphism, automorphism and dualities
- 51A15 Structures with parallelism
- 51A20 Configuration theorems
- 51A25 Algebraization, See also {12Kxx, 20N05}
- 51A30 Desarguesian and Pappian geometries
- 51A35 Non-Desarguesian affine and projective planes
- 51A40 Translation planes and spreads
- 51A45 Incidence structures imbeddable into projective geometries
- 51A50 Polar geometry, symplectic spaces, orthogonal spaces
- 51A99 None of the above but in this section
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