We find an upper bound for the number of limit cycles, bifurcating from the eight-loop of the Duffing oscillator x '' = x - x(3) under the special cubic perturbation
x '' = x - x(3) +lambda(1y) +lambda(2)x(2) +lambda(3)xy +lambda(4)x(2)y.
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Title
Special Cubic Perturbations of the Duffing Oscillator x '' = x - x(3) Near the Eight-Loop
Creators - without role
Lubomir Gavrilov - Toulouse Mathematics Institute
Ameni Gargouri - Prince Sattam Bin Abdulaziz University