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Complete quadrangle

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  1. specifically projective geometry, a complete quadrangle is a projective configuration (4362) consisting of four points, no three of which are collinear, and the six lines defined by those four points

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  2. a term from mathematics

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  3. This configuration was called a tetrastigm by Lachlan (1893), and that term is occasionally still used

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  4. The projective dual configuration (6243) to a complete quadrangle is a complete quadrilateral (called a tetragram by Lachlan), a configuration consisting of four lines, no three of which pass through a common point, and the six points of intersection

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  5. The six lines of a complete quadrangle meet in pairs to form three additional points beyond the four defining the configuration

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
  6. one of the fundamental axioms of projective geometry that these three points can never be collinear (Coxeter 1987: 15)

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on March 2, 2009
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