(2-DIMENSIONAL MODELS WITH VIRASORO-TYPE SYMMETRY ALGEBRA(1))

According to a theory proposed in a previous paper by Lou and Hu, star ting from a realization of a Virasoro-type symmetry algebra, we can ob tain various (2 + 1)-dimensional integrable models under the condition that the models possess the infinitely dimensional Virasoro-type symm etry algebra. An explicit realization of the generalized Virasoro-type symmetry algebra is used to obtain concrete invariant models. A set o f equations which possesses the same infinite dimensional Kac-Moody-Vi rasaro type Lie point symmetry algebra as that of the Kadomtsev-Petvia shvilli equation is given.