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       Dragon Hellfire
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   DIR Return to: Geometry
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       #Post#: 84--------------------------------------------------
       Theorems
   DIR By: Dragon Hellfire
       Date: March 29, 2019, 7:10 pm
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       Configurations of Lines
       Theorem 1. For all configurations of n points in a plane, either
       all n points form a line or there is a line which contains
       exactly two of the points.
       Theorem 2. For all configurations of n>3 points not all in a
       line, the set of lines going through at least two points
       contains at least n lines. (Sylvester-Gallai Theorem
  HTML https://en.wikipedia.org/wiki/Sylvester%E2%80%93Gallai_theorem)
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