Fold-and-cut Theorem

Games on Graphs

Icosian

Sim

Star

Square

Computers vs Proofs

From cutting puzzles to Hilbert's 3rd problem

Divisibility of Fiboncci numbers

Durer's Conjecture

Green-Tao Theorem

Morley's Theorem

Nanotubes and Geometry

Pick's Theorem

Puzzles

From aperiodic tilings to quasicrystals

Wrong Formulas