The Sylvester graph of a configuration is the set of Ordinary Points and Ordinary Lines.

**References**

Guy, R. K. ``Monthly Unsolved Problems, 1969-1987.'' *Amer. Math. Monthly* **94**, 961-970, 1987.

Guy, R. K. ``Unsolved Problems Come of Age.'' *Amer. Math. Monthly* **96**, 903-909, 1989.

© 1996-9

1999-05-26