The triple-line conjecture for point sets

Let \CH\CH be a finite set of points, and let \harompt\CH\harompt{\CH} denote the set of triple lines determined by \CH\CH; write \CH|\CH| for the number of points in \CH\CH. For a constant cc, suppose that

Triple-line conjecture. If

\harompt\CHc\CH2,|\harompt{\CH}| \geq c|\CH|^2,

then ten or more points of \CH\CH lie on a possibly degenerate cubic, provided that \CH>n0(c)|\CH|>n_0(c).

This conjecture asserts that a quadratic number of triple lines forces a substantial subset of the points onto a cubic curve, including degenerate cubics. The statement is presented as a natural expectation based on the examples discussed in the paper; its resolution is not specified in the supplied text.

Sources & referencesView supporting material

Primary source

György Elekes and Endre Szabó, “On Triple Lines and Cubic Curves — the Orchard Problem revisited”, arXiv:1302.5777 (2013).

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