Symmetry group theorem to the Lin-Tsien equation and conservation laws   relating to the symmetry of the equation?
  In this paper, We derive the symmetry group theorem to the Lin-Tsien equation by using the modified CK's direct method, from which we obtain the corresponding symmetry group. More importantly, conservation laws corresponding to the Kac-Moody-Virasoro symmetry algebra of Lin-Tsien equation is obtained up to second order group invariants. 
Liu Xi-Zhong
nlin.SI math-ph math.MP