restart;with(DEtools):For c=2.3 there is a limit cycle, it period doubles by c=3.3, and for c=3.3 there is period three behavior. The Rossler attractor occurs at c=6.3a:=0.2;b:=0.2;c:=5.3;Rossler:= diff(x(t),t)=-y(t)-z(t),diff(y(t),t)=x(t)+a*y(t),diff(z(t),t)=b+x(t)*z(t)-c*z(t);DEplot3d({Rossler},{x(t),y(t),z(t)},t=50..100,[[x(0)=1,y(0)=1,z(0)=1]],scene=[x(t),y(t),z(t)],stepsize=0.05);