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QUADRATIC SYSTEMS WITH A 3RD-ORDER (OR 2ND-ORDER) WEAK FOCUS |
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| Authors: | Zhang Pingguang |
| Abstract: | In this paper, we prove that a planar quadratic systems with a 3rd-order weak focus has at most one limit cycle, and a planar quadratic system with a 2nd-order weak focus has at most two limit cycles. |
| Keywords: | quadratic system weak focus limit cycle uniqueness |
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