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On the sets of $n$ points forming $n+1$ directions
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abstract
Let $S$ be a set of $n\geq 7$ points in the plane, no three of which are collinear. Suppose that $S$ determines $n+1$ directions. That is to say, the segments whose endpoints are in $S$ form $n+1$ distinct slopes. We prove that $S$ is, up to an affine transformation, equal to $n$ of the vertices of a regular $(n+1)$-gon. This result was conjectured in 1986 by R. E. Jamison. In an addendum to the paper, we show that a much stronger result can be obtained as a corollary of a structure theorem of Green and Tao on point sets spanning few ordinary lines.
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Cited by 1 Pith paper
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On sets of $n$ points in general position that determine lines that can be pierced by $n$ points
Under an outside-segment piercing condition, any n-point general-position set together with its n piercing points is contained in a cubic curve.
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