Abstract
Abstract In this paper, by using the normal form, blow-up theory and the technique of global bifurcations, we study the singularity at the origin with threefold zero eigenvalue for nonsymmetric vector fields with nilpotent linear part and 4-jet C ∞ -equivalent to y ∂ ∂ x + z ∂ ∂ y + ax 3 y ∂ ∂ z , with a ≠ 0, and analytically prove the existence of Sil’nikov bifurcation, and then of the strange attractor for certain subfamilies of the nonsymmetric versal unfoldings of this singularity under some conditions.
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