Sets with no empty convex 7-gons
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Date
1982
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Abstract
Erdos has defined g(n) as the smallest integer such that any set of g(n) points in the plane, no three collinear, contains the vertex set of a convex n-gon whose interior contains no point of this set. Arbitrarily large sets containing no empty convex 7-gon are constructed, showing that g(n) does not exist for n > 7. Whether g(6)
exists is unknown.