Résumé:
The objective of this work is to study the existence of bifurcations of
zero-Hopf type at the so-called Chen–Wang differential system
y
x
y
z
z
,
,
y
x
2
xz
3
y
2
a
.
The main tool up to now for studying a zero-Hopf bifurcation is to
pass the system to the normal form of a zero-Hopf bifurcation. Our
analysis of the zero-Hopf bifurcation is different; we study them
directly using the averaging theory.
In the second part of this work, we study the existence of zero-Hopf
bifurcations of a Lorenz-Haken system in 4
R
the averaging theory.