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math.CA2017
Bifurcation of limit cycles by perturbing piecewise smooth integrable differential systems with four zones
Jihua Yang, Liqin Zhao
This paper deals with the problem of limit cycle bifurcations for piecewise smooth integrable differential systems with four zones. When the unperturbed system has a family of peri…
math.CA2017★ 1 cited
On the number of zeros of Abelian integrals for discontinuous quadratic differential systems
Jihua Yang, Liqin Zhao, Shiyou Sui
Applying the Picard-Fuchs equation to the discontinuous differential system, we obtain the upper bounds of the number of zeros for Abelian integrals of four kinds of quadratic diff…