Let ES(n) denote the minimum natural number such that every set of ES(n) points in general position in the plane contains n points in convex position. In 1935, ErdAs and Szekeres proved that ES. In 1961, they obtained the lower bound , which they conjectured to be optimal. In this paper, we prove that ES(n)
Joachim Stubbe, Luigi Provenzano, Paolo Luzzini