Abstract
In the paper (Ramos-Prieto et al., Sci. Rep. 8, 8401 2018), among other things, the Ermakov-Lewis invariant was constructed for the time dependent harmonic oscillator in Koopman-von Neumann mechanics. We point out that there is a simpler method that allows one to find this invariant.
References
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Sen, A., Silagadze, Z. Ermakov-Lewis Invariant in Koopman-von Neumann Mechanics. Int J Theor Phys 59, 2187–2190 (2020). https://doi.org/10.1007/s10773-020-04492-3
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DOI: https://doi.org/10.1007/s10773-020-04492-3