China
In this paper, we study the number of limit cycles H(n) bifurcating from the piecewise smooth system formed by the quadratic reversible system (r22) for y ≥ 0 and the cubic system x˙ = y 1 + ¯x2 + y2 , y˙ = −¯x 1 + ¯x2 + y2 for y < 0 under the perturbations of polynomials with degree n, where x¯ = x − 1. By using the first-order Melnikov function, it is proved that 2n +3 ≤ H(n) ≤ 2n +7 for n ≥ 3 and the results are sharp for n = 0, 1, 2.
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