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  "body": "\n## Summary\n\nA limit cycle is a closed trajectory of a planar dynamical system with one property. At least one other trajectory spirals into it as time tends to $\\infty$ or to $-\\infty$.\nLimit cycles model oscillations that sustain themselves. See the [[definition|0EERDDPSVT]].\n\n## Remarks\n\nHenri Poincaré started the study of limit cycles.\n",
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