Pentagon Tiling Proof Solves Century-Old Math Problem | Quanta Magazine

▻https://www.quantamagazine.org/pentagon-tiling-proof-solves-century-old-math-problem-20170711

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A French mathematician has completed the classification of all convex pentagons, and therefore all convex polygons, that tile the plane.

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Rao said he felt disappointed not to have discovered any additional families, but tiling experts say that proving a complete list of 15 is more significant than simply finding a new working example.