Subjects: Emotional intelligence; Executive functions; Academic achievement
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Subjects: Nilpotent center; Degenerate center; Lyapunov constants
Subjects: Nonlinear differential systems; Integrability problem; Degenerate center problem
Subjects: Two-dimensional system; First integral; Complex cubic system
Subjects: Two dimensional differential systems; Nilpotent centers; Cubic polynomial differential systems
Subjects: Nilpotent center problem; Analytic integrability; Cherkas method
Subjects: Differential systems; Averaging method; Limit cycle
Subjects: Integrability; Center problem; Time-reversibility
Subjects: Integrability; Complex center-focus problem; Lyapunov constants
Subjects: Cyclicity; Limit cycle; Nilpotent center