Main Article Content

В. В. Атамась
В. С. Денисенко
В. О. Денисенко


In this paper a qualitative analysis of the nonlinear dynamic advertising diffusion model have been carried out. Using the first Lyapunov method, the  asymptotic stability of the equilibrium position of the system of equations of perturbed motion (stability by linear approximation) has been investigated and sufficient asymptotic stability conditions in terms of algebraic inequalities has been obtained based on Routh-Hurwitz conditions. The domain of asymptotic stability has been constructed. To investigate stability of equilibrium position in a critical case we first transform our initial nonlinear system of differential equations to a normal form of Poincare. Then using the second Lyapunov method (quadratic positive definite Lyapunov function), we establish the asymptotic stability of a singular point in the critical case. It is shown that the boundary of the asymptotic stability domain is safe and there is a soft loss of stability. The existence of a stable limit cycle (Hopf bifurcation) is proved. Basing on the Poincare-Bendixon theorem, the existence of the limit cycle (stable periodic solution) has been established. Using the  Poincare normal form, the parameters of self-oscillations and the formula for limit cycle and its period  have been approximately  determined.

Article Details

Mathematical and Calculation Physics
Author Biographies

В. В. Атамась, The Bohdan Khmelnytsky National University of Cherkasy

Candidate of physical and mathematical sciences, associate professor, head of the department of algebra and mathematical analysis

В. С. Денисенко, The Bohdan Khmelnytsky National University of Cherkasy

Candidate of physical and mathematical sciences, associate professor, assistant professor of economics and business modeling department

В. О. Денисенко, The Bohdan Khmelnytsky National University of Cherkasy

Candidate of Economic Sciences, Senior Lecturer of the Department of Economics and International Economic Relations


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