On the dynamics of a class of Kolmogorov systems

R. Boukoucha

Sibirskie èlektronnye matematičeskie izvestiâ, Tome 13 (2016), pp. 734-739

Résumé

In this paper we charaterize the integrability and the non-existence of limit cycles of Kolmogorov systems of the form \begin{equation*} \left\{ \begin{array}{l} x^{\prime }=x\left( P\left( x,y\right) +\left( \frac{R\left( x,y\right) }{ S\left( x,y\right) }\right) ^{\lambda }\right) , \\ y^{\prime }=y\left( Q\left( x,y\right) +\left( \frac{R\left( x,y\right) }{ S\left( x,y\right) }\right) ^{\lambda }\right) , \end{array} \right. \end{equation*} where $P\left( x,y\right) ,$ $Q\left( x,y\right) ,$ $R\left( x,y\right) ,$ $ S\left( x,y\right) $ are homogeneous polynomials of degree $n,$ $n,$ $m,$ $a$ respectively and $\lambda \in \mathbb{Q} ^{\ast }$. Concrete example exhibiting the applicability of our result is introduced.

Détail

Keywords: Kolmogorov system, first integral, periodic orbits, limit cycle.