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    Importing Euclidean length ratios into a projective proof... — Carmelics
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    Challenges→The cross-ratio of four collinear points P, Q, R, S is uniquely determined

    Importing Euclidean length ratios into a projective proof smuggles in assumptions that are unavailable within the projective framework being described.

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

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