Jihua Yang

collaborators

2 papers

math.DS2025

Limit cycles appearing from the perturbation of a cubic isochronous center

Jihua Yang, Qipeng Zhang

For a polynomial differential system $x ˙ = - y + i + j = 3 \sum I^\pm_{i, j} x^{i} y^{j}, y ˙ = x + i + j = 3 \sum I^_{i, j}^{2} x^{i} y^{j},$ Pleshkan (Differ. Equations, 1969) proved t…

math.DS2025

Bifurcation of limit cycles from a cubic reversible isochrone

Jihua Yang, Qipeng Zhang

This paper is devoted to study the limit cycle problem of a cubic reversible system with an isochronous center, when it is perturbed inside a class of polynomials. An upper bound o…