Abstract
instead of being estimated by using Eq. (4). Equations (1) and (2) possess an exact solution, and hence a comparison of accuracy of Eqs. (4) and (5) can be carried out. Hu has shown numerically that Eq. (3), contrary to traditional application of Eq. (5), yields suitable results even for 0 ≤ e ≤ ∞. Hu claims that he has derived a new perturbation technique that is valid for large parameters.1 However, this should be treated rather as a particular case, and such a general statement for any other dynamical systems remains invalid. In order to explain the result obtained by Hu1 we will recall the exact formula in what follows:
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