Abstract
This work is part of a wider study of the significance of the existence of invariant algebraic curves for planar polynomial differential systems. The class of real quadratic systems having a cubic invariant algebraic curve is examined. Using affine canonical forms for the members of this class we show that no system of this type has limit cycles except for two cases. For these cases, concrete examples are given with a limit cycle. We also include a simple and short proof on the nonexistence of quadratic systems with an algebraic limit cycle of third degree.
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