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Euclid's sixth postulate

  1. Jul 30, 2013 #1

    Has anybody heard of Euclid's sixth postulate ? It says : Two lines do not contain a space.

    I don't know why, but I'm only finding this postulate in my things, not anywhere else.... Help ? Thanks
  2. jcsd
  3. Jul 30, 2013 #2
    I'm not an expert on Euclidean geometry, but I've never heard of it.

    Where exactly did you encounter this?
  4. Jul 30, 2013 #3
  5. Jul 30, 2013 #4

    jim mcnamara

    User Avatar

    Staff: Mentor

    It is purely a modern invention
    'Some modern treatments add a sixth postulate, the rigidity of the triangle, which can be used as an alternative to superposition.'

    p 5. Coxeter, H.S.M. (1961). Introduction to Geometry. New York: Wiley.
  6. Jul 30, 2013 #5
    Can someone give me insight on it ? Thank you.
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