Starting from a Backlund transformation and taking a special ansatz for the function f, we can obtain a much more generalexpression of solution that includes so
The generalized conditional symmetry approach is applied to study the variable separation of the extended wave equations. Complete classification of those equat
Based on an extensive study of the Dyson-Schwinger equations for a fully dressed quark propagator in the 'rainbow' approximation, a parametrized form of
The exact invariants and the adiabatic invariants of Raitzin's canonical equations of motion for the nonholonomic system of non-Chetaev's type are studi