Polski: Zgodnie z twierdzeniem Poincarego-Hopfa zamknięta orbita może otaczać jedno ognisko, lub dwa ogniska i jedno siodło, nigdy jednak wyłącznie dwa ogniska ani wyłącznie jedno siodło.
English: According to Poincare-Hopf theorem closed trajectory can encircle two centres and one saddle or one centre but never just the saddle. (Here for a Hamiltonian system with Hamiltonian being sum of two Gaussians. )
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