Edge Tessellation and Stamp Foldings Puzzles

Details Edge Tessellation and Stamp Foldings Puzzles Edge Tessellation and Stamp Foldings Puzzles

2009-08-22

arxiv.org/abs/0908.3257v4

Mathematics

Geometric Topology

7 pages, 7 figures

Scientific paper

An edge tessellation is a tiling of the plane generated by reflecting a polygon in its edges. We prove that a polygon generating an edge tessellation is one the following eight types: a rectangle; an equilateral, 60-right, isosceles right, or 120-isosceles triangle; a 120-rhombus; a 60-90-120 kite; or a regular hexagon. A stamp folding puzzle is a paper folding problem constrained to the perforations on a sheet of postage stamps. We establish the following conjecture due to G. Frederickson: "Although triangular stamps have come in a variety of different triangular shapes, only three shapes seem suitable for [stamp] folding puzzles: equilateral, isosceles right triangles, and 60-right triangles."

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