The period function of quadratic generalized Lotka-Volterra systems without complex invariant lines
The authors analyze the monotonicity of period function of the planar generalized quadratic Lotka-Volterra systems. By taking two invariant lines as new coordinate axes and making a constant time scale change to transform the systems and simplify the first integrals, it is proved for the case without complex invariant lines that the period function is monotone increasing.
scientific article; zbMATH DE number 7471759
scientific article