51M25 Length, area and volume [See also <a href="#code:26B15">26B15</a>]

51M30 Line geometries and their generalizations [See also <a href="#code:53A25">53A25</a>]

51M35 Synthetic treatment of fundamental manifolds in projective geometries (Grassmannians, Veronesians and their generalizations) [See also <a href="#code:14M15">14M15</a>]

51M99 None of the above, but in this section

51N05 Descriptive geometry [See also <a href="#code:65D17">65D17</a>, <a href="#code:68U07">68U07</a>]

51N25 Analytic geometry with other transformation groups

51N30 Geometry of classical groups [See also <a href="#code:20Gxx">20Gxx</a>, <a href="#code:14L35">14L35</a>]

51N35 Questions of classical algebraic geometry [See also <a href="#code:14Nxx">14Nxx</a>]

51N99 None of the above, but in this section

51Pxx Geometry and physics (should also be assigned at least one other classification number from Sections 70--86)

51P05 Geometry and physics (should also be assigned at least one other classification number from Sections 70--86)

51P99 None of the above, but in this section

52-00 General reference works (handbooks, dictionaries, bibliographies, etc.)

52-01 Instructional exposition (textbooks, tutorial papers, etc.)

52-02 Research exposition (monographs, survey articles)

52-03 Historical (must also be assigned at least one classification number from Section 01)

52-04 Explicit machine computation and programs (not the theory of computation or programming)

52-06 Proceedings, conferences, collections, etc.

52A01 Axiomatic and generalized convexity

52A05 Convex sets without dimension restrictions

52A07 Convex sets in topological vector spaces [See also <a href="#code:46A55">46A55</a>]

52A10 Convex sets in $2$ dimensions (including convex curves) [See also <a href="#code:53A04">53A04</a>]

52A15 Convex sets in $3$ dimensions (including convex surfaces) [See also <a href="#code:53A05">53A05</a>, <a href="#code:53C45">53C45</a>]

52A20 Convex sets in $n$ dimensions (including convex hypersurfaces) [See also <a href="#code:53A07">53A07</a>, <a href="#code:53C45">53C45</a>]