http://demonstrations.wolfram.com/PhasePlanePlotOfTheVanDerPolDifferentialEqu...
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This shows the phase plane plot (x'(t) versus x(t) ) of the van der Pol nonlinear differential equation x''(t) - lambda(1 - x(t)^2)x'(t) + k x(t) = 0.
Contributed by: Nasser Abbasi
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