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