Poincare-Bendixson trichotomy

Although this is the classical statement of this theorem, a simple consequence is often useful. This is sometimes called the Poincare-Bendixson trichotomy. 

Tl] H. R. Thieme (1992), Convergence results and a Poincare-Bendixson trichotomy for asymptotically autonomous differential equations, Journal of Mathematical Biology 30 755-63. 

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See also in sourсe #XX -- [ ]

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