51-00 General reference works (handbooks, dictionaries, bibliographies, etc.) pertaining to geometry 44

51F15 Reflection groups, reflection geometries [See also 20H10, 20H15] {For Coxeter groups, see 20F55} 1127

51M16 Inequalities and extremum problems in real or complex geometry {For convex problems, see 52A40} 877

51M35 Synthetic treatment of fundamental manifolds in projective geometries (Grassmannians, Veronesians and their generalizations) [See also 14M15] 333

51Pxx Classical or axiomatic geometry and physics (should also be assigned at least one other classification number from Sections 70-XX–86-XX) 340

51P05 Classical or axiomatic geometry and physics (should also be assigned at least one other classification number from Sections 70-XX–86-XX) 331