Abstract
Eszter Klein’s theorem claims that among any 5 points in the plane, no three collinear, there is the vertex set of a convex quadrilateral.An application of Ramsey’s theorem then yields the classical Erdös-Szekeres theorem [19]: For every integer n ≥ 3 there is an N0 such that, among any set of N ≥ N 0 points in general position in the plane, there is the vertex set of a convex n-gon. Let f(n) denote the smallest such number.
The authors gratefully acknowledge that they have been partially supported by Hungarian Research Grants OTKA T032452 and F030822, respectively.
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Bárány, I., Károlyi, G. (2001). Problems and Results around the Erdös-Szekeres Convex Polygon Theorem. In: Akiyama, J., Kano, M., Urabe, M. (eds) Discrete and Computational Geometry. JCDCG 2000. Lecture Notes in Computer Science, vol 2098. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-47738-1_7
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