ALGORITHM FOR CALCULATING THE STABILITY COEFFICIENTS IN THE CASE OF MULTIPLE OR COMPLEX FOCUS
The paper describes the procedure for calculating stability coefficients (Lyapunov values) in the case of multiple or complex focus, based on a special representation of polynomial systems ([1], [2]). For polynomial systems of the third degree, the basic relations for calculating the Lyapunov values are obtained. For a quadratic system, the values of three Lyapunov quantities were found, and due to the choice of the structure of the coefficients, they were given a form convenient for research.