51XX 


Geometry {For algebraic geometry, see 14XX} 


5100 
General reference works (handbooks, dictionaries, bibliographies, etc.) 


5101 
Instructional exposition (textbooks, tutorial papers, etc.) 


5102 
Research exposition (monographs, survey articles) 


5103 
Historical (must also be assigned at least one classification number from Section 01) 


5104 
Explicit machine computation and programs (not the theory of computation or programming) 


5106 
Proceedings, conferences, collections, etc. 

51Axx 

Linear incidence geometry 

51Bxx 

Nonlinear incidence geometry 

51Cxx 

Ring geometry (Hjelmslev, Barbilian, etc.) 

51Dxx 

Geometric closure systems 

51Exx 

Finite geometry and special incidence structures 

51Fxx 

Metric geometry 

51Gxx 

Ordered geometries (ordered incidence structures, etc.) 

51Hxx 

Topological geometry 

51Jxx 

Incidence groups 

51Kxx 

Distance geometry 

51Lxx 

Geometric order structures [See also 53C75] 

51Mxx 

Real and complex geometry 

51Nxx 

Analytic and descriptive geometry 

51Pxx 

Geometry and physics (should also be assigned at least one other classification number from Sections 70–86) 