Abstract:
In the recent literature, several equations have been studied with purported new approaches because the authors claim that these equations were not amenable to exact treatment using known methods. But we show that all these equations have sufficient Lie point symmetries to make them integrable by quadrature, if not linearizable. When one gets a “miraculous haul of fishes”, namely, exact methods of solution, first integrals, even linearization, then Lie symmetries shall be found. Lie group analysis was and should still be considered an essential tool for anyone who wants to solve equations of relevance in physics and other scientific fields.
Keywords:
Lie group analysis, Jacobi's last multiplier, first integrals.
This publication is cited in the following 3 articles:
M. C. Nucci, K. M. Tamizhmani, “Lagrangians for Dissipative Nonlinear Oscillators: The Method of Jacobi Last Multiplier”, JNMP, 17:2 (2021), 167
Nucci M.C., Tamizhmani K.M., “Using an old method of Jacobi to derive Lagrangians: A nonlinear dynamical system with variable coefficients”, Nuovo Cimento Soc. Ital. Fis. B, 125:3 (2010), 255–269
M. C. Nucci, “Jacobi's last multiplier, Lie symmetries, and hidden linearity: “Goldfishes” galore”, Theoret. and Math. Phys., 151:3 (2007), 851–862