Pasch's theorem
Result about 4 points on a line which cannot be derived from Euclid's postulates / From Wikipedia, the free encyclopedia
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Not to be confused with Pasch's axiom regarding a line through a triangle.
In geometry, Pasch's theorem, stated in 1882 by the German mathematician Moritz Pasch,[1] is a result in plane geometry which cannot be derived from Euclid's postulates.