Abstract
I HAVE long thought that by the words, commonly translated evenly, Euclid means symmetrically. The symmetry can be tested by turning the line over; for in stance, the edge of a flat ruler is straight if, when turned over, it coincides with its original position.
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EVERETT, J. Euclid's Definition of a Straight Line. Nature 69, 535 (1904). https://doi.org/10.1038/069535a0
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DOI: https://doi.org/10.1038/069535a0
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