KöMaL 2023 A868
A set of points in the plane is called disharmonic, if the ratio of any two distances between the points is between and , or at least 100 or at most . Is it true that for any distinct points in the plane it is always possible to find distinct points that form a disharmonic set of points, and moreover , and are collinear in this order if and only if , and are collinear in this order (for all distinct )?
Official text KöMaL. Quoted with source.
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