Abstract
Kamel has recently extended to non-Hamiltonian equations a perturbation theory using Lie transforms. We show here how Kamel's extension can be approached from an intrinsic viewpoint, which reformulation leads to a simpler algorithm. Then we complete Kamel's contribution by establishing the rules for inverting the transformation generated by the perturbation theory, and for composing two such transformations.
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Henrard, J. On a perturbation theory using Lie transforms. Celestial Mechanics 3, 107–120 (1970). https://doi.org/10.1007/BF01230436
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DOI: https://doi.org/10.1007/BF01230436