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Is there a uniform upper bound for the number of limit cycles of a quadratic vector field which has a unique singular point in the plane?

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This survey seems to indicate that the answer is $1.$

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  • $\begingroup$ Thank you for this survey. What part of the survey indicate to $1$? Does the class I contains all quadratic vector field with a unique singularity? $\endgroup$ Sep 5 '17 at 4:46

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