Table 6.

Stability of subsystem 2 equilibrium points, $\forall {\tau }_2\ge 1,\hspace{0.17em}\forall a_2>1$

x2	$\hspace{0.17em}-\infty \hspace{0.17em}$	$x_2(Det)$		$x_2(T{r}_1)$		-0.25		$x_2(T{r}_2)$		$\hspace{0.17em}+\infty \hspace{0.17em}$
Det	+		−		−		+		+
Tr	−		−		+		+		−
Stability	Stable focus		Saddle		Saddle		Unstable focus		Stable focus
	/node						/node		/node