
#1
Dec511, 05:54 AM

P: 147

Hi All,
for a Van Der Pol dyanmical sysetm , governed by the eqautions x' = a * (x  0.3 x ^3 )  y y' = x i read at http://www.scholarpedia.org/article/...Pol_oscillator that when the system is away from the curve y=x−x3/3 , "a relation x˙ >> y˙=O(1/ϵ) is obtained from equations (2) and (3). Therefore, the system moves quickly in the horizontal direction. When the system enters the region where x−x3/3−y=O(1/ϵ2) , x˙ and y˙ are comparable because both of them are O(1/ϵ)". I really do not get this entirely.`I am unsure of how the relationship involving the infinitesimals are derived. How are these realtionship justified? Can anybody please try to give us a hint? Thank you so much Muzialis 


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