Opaque set 1970-01-01
Orchard-planting problem 1970-01-01
Packing density 1970-01-01
Penrose tiling 1970-01-01
Pinwheel tiling 1970-01-01
Polycube 1970-01-01
Quaquaversal tiling 1970-01-01
Regular map (graph theory) 1970-01-01
Roberts's triangle theorem 1970-01-01
Sphere packing 1970-01-01
Sphere packing in a cylinder 1970-01-01
Squaring the square 1970-01-01
Straight skeleton 1970-01-01
Tarski's circle-squaring problem 1970-01-01
The Erdős Distance Problem 1970-01-01
Voronoi diagram 1970-01-01
Weighted Voronoi diagram 1970-01-01
Weyl's tile argument 1970-01-01