Convex Set: Set, Euclidean Space, Straight Line, Cube (geometry)

K Set (geometry): Discrete Geometry, Euclidean Plane, Space

Hadwiger Conjecture (combinatorial geometry): Combinatorial Geometry, Convex Body, Euclidean Space

Surface of Revolution: Surface, Euclidean Space, Curve, Straight Line, Cylinder (Geometry)

Outer Billiard: Dynamical System, Convex Set, Euclidean Plane, Hyperbolic Geometry, Billiards, Complex Vector Space