Mikhailov criterion

The characteristic polynomial P(A) of system (29) is complex, hence the Hurwitz criterion is not applicable. To analyze the stability of the complex third order polynomial, we use the Mikhailov criterion [11] instead. The Mikhailov criterion can be stated as follows. Form the polynomial P iu) = Pr < ) + where w, Pr, and Pi are all real. Then the necessary and... 

According to point 4 of the Mikhailov criterion (Section 2.2.2) system (36) becomes unstable when any pair of the real roots of the polynomials... 

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