- #1

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I wondered how this region is found and I found out that a Lyapunov function is used.

However, I tried to do it another way. I defined r=√(x^2+y^2+z^2). Now I thought: when d/dt r <0 the radial velocity points inward and so there is a trapping region. I calculated this but the result was completely different.

Why doesn’t it work with my way?

Thanks for every awnser!