1. Geometric Approach to Differential Equations 9 (a) (b) (c) (d) x1 t x1 t x1 t x1 t Figure 7. Plots of one position variable as a function of t: (a) orbits tending to a fixed point, (b) a periodic orbit, (c) a quasiperiodic orbit, and (d) a chaotic orbit.

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