Ms. Velan et M. Lakshmanan, LIE SYMMETRIES AND INFINITE-DIMENSIONAL LIE-ALGEBRAS OF CERTAIN NONLINEAR DISSIPATIVE SYSTEMS, Journal of physics. A, mathematical and general, 28(7), 1995, pp. 1929-1942
We point out that the dissipative force-free Duffing oscillator and Ho
lmes-Rand nonlinear oscillator admit infinite dimensional symmetry alg
ebras for certain parametric choices for which the systems become inte
grable. From the nature of the symmetry vector fields one can also wri
te down the integrals of motion for the above systems. In addition we
point out that the other dissipative systems discussed in the literatu
re also admit infinite dimensional Lie algebras.