Abstract
We prove that perturbing the two periodic annuli of the quadratic polynomial reversible Lotka–Volterra differential system ẋ = −y + x 2 − y 2, ẏ = x(1 + 2y), inside the class of all quadratic polynomial differential systems we can obtain the following configurations of limit cycles (0, 0), (1, 0), (2, 0), (1, 1) and (1, 2).
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