Complex isochronous centers and linearization transformations for cubic Z2-equivariant planar systems

Mathematical problems

David Hilbert · Bulletin of the American Mathematical Society · 1902 · 1.2K citations · Full text

A CONCRETE EXAMPLE OF THE EXISTENCE OF FOUR LIMIT CYCLES FOR PLANE QUADRATIC SYSTEMS

Shi Songling · Scientia Sinica · 1980 · 138 citations

Natural Sciences, Mathematics, Algebra +9

A cubic system with thirteen limit cycles

Chengzhi Li, Changjian Liu, Jiazhong Yang · Journal of Differential Equations · 2009 · 132 citations

Natural Sciences, Mathematics, Combinatorics +12

THEORY OF VALUES OF SINGULAR POINT IN COMPLEX AUTONOMOUS DIFFERENTIAL SYSTEMS

Liu Yi-Reng, LI Ji-Ban · Science in China Series A-Mathematics Physics Astronomy & Technological Science · 1990 · 110 citations · Full text

Natural Sciences, Mathematics, Complex Systems +11

Eleven small limit cycles in a cubic vector field

Nonlinearity · 1995 · 106 citations

Natural Sciences, Mathematics, Physics +12