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Plane Geometry - Bruce E. Shapiro

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SECTION 13. INCIDENCE GEOMETRY 55Figure 13.2: Graph diagram illustrating four-point geometry. Every linehas precisely one other line that is parallel to it, and and there is preciselyone parallel line through each point that is not on a given line, and hencefour point geometry obeys the Euclidean parallel postulate.Figure 13.3: Graph diagram illustrating Fano’s geometry. Each line segmentand the circle represents a line in this geometry.Revised: 18 Nov 2012 « CC BY-NC-ND 3.0.

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