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- W2044641374 abstract "In this paper, we study the monotonicity of the period function of the quadratic system <p align=center> $ dot x=- y + x y,quad dot y=x + 2 y^2-c x^2, quad -infty < c < +infty.$ <p align=left class=times> We show that this system has two isochronous centers for $c=1/2$, and its period function has only one critical point for $cin(7/5, 2)$. For all other cases, the period function is monotone. This improves the results in [1]." @default.
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- W2044641374 date "2005-01-01" @default.
- W2044641374 modified "2023-09-26" @default.
- W2044641374 title "On the monotonicity of the period function of a quadratic system" @default.
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- W2044641374 doi "https://doi.org/10.3934/dcds.2005.13.795" @default.
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