| 51-00 |
- |
General reference works (handbooks, dictionaries, bibliographies, etc.) |
| 51-01 |
- |
Instructional exposition (textbooks, tutorial papers, etc.) |
| 51-02 |
- |
Research exposition (monographs, survey articles) |
| 51-03 |
- |
Historical (must also be assigned at least one classification number from Section 01) |
| 51-04 |
- |
Explicit machine computation and programs (not the theory of computation or programming) |
| 51-06 |
- |
Proceedings, conferences, collections, etc. |
| 51Axx |
- |
Linear incidence geometry |
| 51Bxx |
- |
Nonlinear incidence geometry |
| 51C05 |
- |
Ring geometry (Hjelmslev, Barbilian, etc.) |
| 51Dxx |
- |
Geometric closure systems |
| 51Exx |
- |
Finite geometry and special incidence structures |
| 51Fxx |
- |
Metric geometry |
| 51G05 |
- |
Ordered geometries (ordered incidence structures, etc.) |
| 51Hxx |
- |
Topological geometry |
| 51Jxx |
- |
Incidence groups |
| 51Kxx |
- |
Distance geometry |
| 51Lxx |
- |
Geometric order structures |
| 51Mxx |
- |
Real and complex geometry |
| 51Nxx |
- |
Analytic and descriptive geometry |
| 51P05 |
- |
Geometry and physics (should also be assigned at least one other classification number from Sections 70--86) |
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