Chengzhi Li

发表

A Criterion for Determining the Monotonicity of the Ratio of Two Abelian Integrals

Chengzhi Li, Zhifen Zhang, 1996 .

Perturbation from an elliptic Hamiltonian of degree four—IV figure eight-loop

Chengzhi Li, F. Dumortier, 2003 .

Normal Forms and Bifurcation of Planar Vector Fields

S. Chow, Chengzhi Li, Duo Wang, 1994 .

Codimension 2 Symmetric Homoclinic Bifurcations and Application to 1:2 Resonance

Christiane Rousseau, C. Rousseau, Chengzhi Li, 1990, Canadian Journal of Mathematics.

On the uniqueness of limit cycles surrounding one or more singularities for Liénard equations

Freddy Dumortier, Chengzhi Li, Chengzhi Li, 1996 .

Bifurcation of a class of planar non-Hamiltonian integrable systems with one center and one homoclinic loop☆

Chengzhi Li, J. Yu, Jiang Yu, 2002 .

The period function of hyperelliptic Hamiltonians of degree 5 with real critical points

Chengzhi Li, K. Lu, 2008 .

Limit cycles for 3-monomial differential equations

Chengzhi Li, A. Gasull, J. Torregrosa, 2015 .

A simple proof of the uniqueness of periodic orbits in the 1:3 resonance problem

S. Chow, Chengzhi Li, Duo Wang, 1989 .

The period function of reversible Lotka-Volterra quadratic centers

Chengzhi Li, Changjian Liu, Jinming Li, 2022, Journal of Differential Equations.

Slow-Fast Dynamics and Its Application to a Biological Model

Chengzhi Li, 2016 .

Perturbations from an Elliptic Hamiltonian of Degree Four

Freddy Dumortier, Chengzhi Li, Chengzhi Li, 2001 .

Cubic Liénard equations with quadratic damping having two antisaddles

R. Kooij, Chengzhi Li, F. Dumortier, 2000 .

A Simple Proof for the Unicity of the Limit Cycle in the Bogdanov-Takens System

C. Rousseau, Chengzhi Li, Xian Wang, 1990, Canadian Mathematical Bulletin.

Cubic homogeneous polynomial centers

J. Llibre, Chengzhi Li, 2014 .

Perturbations from an Elliptic Hamiltonian of Degree Four: I. Saddle Loop and Two Saddle Cycle☆

Freddy Dumortier, Chengzhi Li, Chengzhi Li, 2001 .

Normal Forms and Bifurcation of Planar Vector Fields: Preface

S. Chow, Chengzhi Li, Duo Wang, 1994 .

Generic unfolding of the nilpotent saddle of codimension 4

Freddy Dumortier, P. Fiddelaers, Chengzhi Li, 2001 .

Normal Forms and Bifurcation of Planar Vector Fields: Codimension Two Bifurcations

S. Chow, Chengzhi Li, Duo Wang, 1994 .

Abelian Integrals and Limit Cycles

Chengzhi Li, Chengzhi Li, 2012 .

Degenerate Hopf bifurcation formulas and Hilbert's 16th problem

William F. Langford, Chengzhi Li, Isabel S. Labouriau, 1989 .

Quadratic perturbations of a class of quadratic reversible systems with two centers

Chengzhi Li, R. Prohens, B. Coll, 2009 .

A unified proof on the weak Hilbert 16th problem for n=2☆

Jaume Llibre, Fengde Chen, Chengzhi Li, 2006 .

A Unified Study on the Cyclicity of Period Annulus of the Reversible Quadratic Hamiltonian Systems

J. Llibre, Chengzhi Li, 2004 .

Remarks on 16th weak Hilbert problem for n = 2*Remarks on 16th weak Hilbert problem for n = 2

Chengzhi Li, Chengzhi Li, Zeng Zhang, 2002 .

QUADRATIC LIENARD EQUATIONS WITH QUADRATIC DAMPING

Freddy Dumortier, Chengzhi Li, Chengzhi Li, 1997 .

Uniqueness of periodic orbits of some vector fields with codimension two singularities

S. Chow, Chengzhi Li, Duo Wang, 1989 .

Perturbation from an elliptic Hamiltonian of degree four—III global centre

Freddy Dumortier, Chengzhi Li, Chengzhi Li, 2003 .

Slow divergence integral and its application to classical Liénard equations of degree 5

Chengzhi Li, K. Lu, 2014 .

Limit Cycles of Differential Equations

Colin Christopher, Chengzhi Li, Chengzhi Li, 2007 .

Canard cycles for predator–prey systems with Holling types of functional response☆

Huaiping Zhu, Chengzhi Li, Huaiping Zhu, 2013 .

Canard phenomenon for an SIS epidemic model with nonlinear incidence

Zhien Ma, Chengzhi Li, Jianquan Li, 2014 .

The cyclicity of the period annulus of a reversible quadratic system

Jaume Llibre, Chengzhi Li, Changjian Liu, 2021, Proceedings of the Royal Society of Edinburgh: Section A Mathematics.

A proof of a Dumortier-Roussarie's conjecture

Chengzhi Li, Changjian Liu, 2022, Discrete and Continuous Dynamical Systems - S.

Codimension 3 B-T bifurcations in an epidemic model with a nonlinear incidence

Zhien Ma, Chengzhi Li, Jianquan Li, 2015 .

Uniqueness of limit cycles for Liénard differential equations of degree four

Jaume Llibre, Chengzhi Li, J. Llibre, 2012 .

A cubic system with thirteen limit cycles

Chengzhi Li, Jiazhong Yang, Changjian Liu, 2009 .

Moduli-Free Normal Forms and Linearization of Vector Fields

Chengzhi Li, Zhihua Ren, Jiazhong Yang, 2006, Int. J. Bifurc. Chaos.

Integrability and linearizability of the Lotka-Volterra systems

Chengzhi Li, Changjian Liu, Chengzhi Li, 2004 .

Perturbations of symmetric elliptic Hamiltonians of degree four

Chengzhi Li, R. Roussarie, P. Mardešić, 2006 .

Linear Estimation of the Number of Zeros of Abelian Integrals for Some Cubic Isochronous Centers

Jaume Llibre, Chengzhi Li, J. Llibre, 2002 .

Study of Perturbed Lotka–Volterra Systems Via Abelian Integrals

Chengzhi Li, Zhifen Zhang, A. Guillamón, 1996 .

On the number of limit cycles bifurcating from a non-global degenerated center☆

Armengol Gasull, Chengzhi Li, Changjian Liu, 2007 .

Bifurcations of limit cycles from quadratic non-Hamiltonian systems with two centres and two unbounded heteroclinic loops

Chengzhi Li, Jiang Yu, I. Iliev, 2005 .

CYCLICITY OF SEVERAL QUADRATIC REVERSIBLE SYSTEMS WITH CENTER OF GENUS ONE

Chengzhi Li, Xianzhong Ma, Long Chen, 2011 .

Abelian Integrals and Limit Cycles

Chengzhi Li, 2011, Qualitative Theory of Dynamical Systems.

The cyclicity of period annulus of a quadratic reversible Lotka–Volterra system

Jaume Llibre, Chengzhi Li, J. Llibre, 2009 .

The cyclicity of period annuli of some classes of reversible quadratic systems

J. Llibre, Chengzhi Li, C. Liu, 2006 .

The cyclicity of period annuli of degenerate quadratic Hamiltonian systems with elliptic segment loops

Shui-Nee Chow, Yingfei Yi, Chengzhi Li, 2002, Ergodic Theory and Dynamical Systems.

Unfolding of a Quadratic Integrable System with Two Centers and Two Unbounded Heteroclinic Loops

Freddy Dumortier, Chengzhi Li, Chengzhi Li, 1997 .