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51D20 - Geometry :: Geometric closure systems :: Combinatorial geometries

  1. Bertrand's problem owned by PrimeFan
  2. circle line picking owned by PrimeFan
  3. circumscribe owned by PrimeFan
  4. happy ending problem owned by PrimeFan
  5. inscribe owned by PrimeFan
  6. lazy caterer's sequence owned by PrimeFan
  7. length owned by PrimeFan
  8. Motzkin number owned by PrimeFan
  9. Ramsey-theoretic proof of the Erdős-Szekeres theorem owned by mps

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