CO)=LC()=∑ce if V re s;<0,Ve→>0(t→>∞) The system Is stable, f any Res; >0, the ene→>o(t→) Then total response C()=∑ce→>o The system is unstables t n i i i C t L C s c e = − = = 1 1 ( ) [ ( )] if Re s  0, e →0 (t →) st i i The system is stable; if any Re s  0, then e →  (t → ) s t j j =  →  = s t n i i i C t c e 1 Then ( ) total response The system is unstable