51XX 


Geometry {For algebraic geometry, see 14XX} 

51Mxx 

Real and complex geometry 


51M04 
Elementary problems in Euclidean geometries 


51M05 
Euclidean geometries (general) and generalizations 


51M09 
Elementary problems in hyperbolic and elliptic geometries 


51M10 
Hyperbolic and elliptic geometries (general) and generalizations 


51M15 
Geometric constructions 


51M16 
Inequalities and extremum problems {For convex problems, see 52A40} 


51M20 
Polyhedra and polytopes; regular figures, division of spaces [See also 51F15] 


51M25 
Length, area and volume [See also 26B15] 


51M30 
Line geometries and their generalizations [See also 53A25] 


51M35 
Synthetic treatment of fundamental manifolds in projective geometries (Grassmannians, Veronesians and their generalizations) [See also 14M15] 


51M99 
None of the above, but in this section 