harmonic division
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Connections
cross-ratio
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complete quadrangle
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Bertrand Russell
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International Standard Book Number
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real number
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digital object identifier
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parallelogram
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golden ratio
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Cornell University
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Internet Archive
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line segment
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complex plane
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opposite number
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projective geometry
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Emil Artin
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finite field
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midpoint
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Jean Dieudonné
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Desargues' theorem
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skew lines
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