53Axx Classical differential geometry

53A04  Curves in Euclidean space
53A05  Surfaces in Euclidean space
53A07  Higher-dimension and -codimension surfaces in Euclidean
               $n$-space
53A10  Minimal surfaces, surfaces with prescribed mean curvature,
               See also {49Q05, 49Q10, 53C42}
53A15  Affine differential geometry
53A17  Kinematics
53A20  Projective differential geometry
53A25  Differential line geometry
53A30  Conformal differential geometry
53A35  Non-Euclidean differential geometry
53A40  Other special differential geometries
53A45  Vector and tensor analysis
53A50  Spinor analysis
53A55  Differential invariants (local theory), geometric objects
53A60  Geometry of webs, See also {14C21, 20N05}
53A99  None of the above but in this section