https://www.quantamagazine.org/pentagon-tiling-proof-solves-century-old-math-problem-20170711/
Pentagon Tiling Proof Solves Century-Old Math Problem | Quanta Magazine
Feb 23, 2026 - A French mathematician has completed the classification of all convex pentagons, and therefore all convex polygons, that tile the plane.
pentagon tilingmath problemproofsolvescentury