Finding Unpredictable Behavior in a Simple Ordinary Differential Equation

Finding Unpredictable Behavior in a Simple Ordinary Differential Equations
Humphreys, Lisa D. and Ray Shammas
College Mathematics Journal, Vol. 31, no. 5, pp. 338-346, 2000.

The authors use a nonlinear equation that models the collapse of the Tacoma Narrows Bridge to show how a tiny periodic force can have quite unexpected long-term consequences.