Abstract:
Group classification with respect to admitted point transformation groups is implemented for second-order ordinary differential equations with cubic nonlinearity in the first-order derivative. The result is obtained with the use of invariants of the equivalence transformation group of the family of equations under consideration. The corresponding Riemannian metric is found for the equations that are the projection of a system of geodesics to a two-dimensional surface.
Keywords:
transformation group, symmetry, equivalence, invariant, group classification.