Abstract
We characterize the integrability and the non-existence of periodic orbits for the 2-dimensional Kolmogorov systems of the formẋ=x(Pn(x,y)+Rm(x,y)),ẏ=y(Qn(x,y)+Rm(x,y)),where n and m are positive integers and Pn,Qn and Rm are homogeneous polynomials of degree n,n and m, respectively.
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