A generalized Kadomtsev-Petviashvili equation, describing water waves in oceans of varying depth, density and vorticity is discussed. A priori, it involves 9 arbitrary functions of one, or two variables. The conditions are determined under which the equation allows an infinite-dimensional symmetry algebra. This algebra can involve up to three arbitrary functions of time. It depends on precisely three such functions if and only if it is completely integrable. © 2002 Elsevier Science (USA). All rights reserved.
Güngör, F., & Winternitz, P. (2002). Generalized Kadomtsev-Petviashvili equation with an infinite-dimensional symmetry algebra. Journal of Mathematical Analysis and Applications, 276(1), 314–328. https://doi.org/10.1016/S0022-247X(02)00445-6