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Upper bounds for the associated number of zeros of Abelian integrals for two classes of quadratic reversible centers of genus one
Xiaochun Hong,Junliang Lu,Yanjie Wang
Keywords:Abelian integral, quadratic reversible center, weakened Hilbert’s 16th problem
Abstract:
      In this paper, by using the method of Picard-Fuchs equation and Riccati equation, we study the upper bounds for the associated number of zeros of Abelian integrals for two classes of quadratic reversible centers of genus one under any polynomial perturbations of degree n, and obtain that their upper bounds are 3n−3 (n ≥ 2) and 18[n/2] +3[(n-1)/2] (n ≥ 4) respectively, both of the two upper bounds linearly depend on n.