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Ideal polyhedron (en.wikipedia.org/wiki/Ideal_po), a polyhedron in hyperbolic space with all vertices at infinity

Sylvester–Gallai theorem (en.wikipedia.org/wiki/Sylveste), that every finite set of points in the Euclidean plane has a line that either passes through all of them or through exactly two of them

Both newly promoted to Good Article status on Wikipedia.

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