If a sequence of Double Points is passed as a Closed Curve is traversed, each Double Point appears once in an Even place and once in an Odd place.

**References**

Rademacher, H. and Toeplitz, O. *The Enjoyment of Mathematics: Selections from Mathematics for the Amateur.*
Princeton, NJ: Princeton University Press, pp. 61-66, 1957.

© 1996-9

1999-05-25