If a plane autonomous system has a periodic solution, then
Chapter 10, Problem 10.1.29(choose chapter or problem)
If a plane autonomous system has a periodic solution, then there must be at least one critical point inside the curve generated by the solution. In 2730 use this fact together with a numerical solver to investigate the possibility of periodic solutions.x y 3 y y(1 3x2 2y2) x y
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