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    • Note on the number of obtuse angles in point sets 

      Fabila-Monroy, Ruy; Huemer, Clemens; Tramuns, Eulàlia (2014-09)
      Open Access
      In $1979$ Conway, Croft, Erd\H{o}s and Guy proved that every set $S$ of $n$ points in general position in the plane determines at least $\frac{n^3}{18}-O(n^2)$ obtuse angles and also presented a special set of $n$ points ...