The Schwarzian derivative is defined by

The Feigenbaum Constant is universal for 1-D Maps if its Schwarzian derivative is Negative in the bounded interval (Tabor 1989, p. 220).

**References**

Tabor, M. *Chaos and Integrability in Nonlinear Dynamics: An Introduction.* New York: Wiley, 1989.

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1999-05-26