We carry out the group classification of the class of two-dimensional shallow water
equations with variable bottom topography using an optimized version of the method of …

We exhaustively classify the Lie reductions of the real dispersionless Nizhnik equation to
partial differential equations in two independent variables and to ordinary differential …

Applying an original megaideal-based version of the algebraic method, we compute the
point-symmetry pseudogroup of the dispersionless (potential symmetric) Nizhnik equation …