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    The cross-ratio formula AB·CD / AD·CB presupposes a metri... — Carmelics
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    Challenges→The cross-ratio of four collinear points P, Q, R, S is uniquely determined

    The cross-ratio formula AB·CD / AD·CB presupposes a metric structure, yet projective geometry is defined precisely by its independence from metric relations.

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    The cross-ratio of four collinear points P, Q, R, S is uniquely determined

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