Irina YEHORCHENKO
Department of Applied Research,
Institute of Mathematics of NAS of Ukraine,
3 Tereshchenkivs'ka Str.,
01601 Kyiv-4, UKRAINE
E-mail: iyegorch@imath.kiev.ua

Group classification of some nonlinear PDE with respect to hidden symmetry

Abstract:
We give a systematic description of some classes of nonlinear PDEs that display hidden symmetry, with reduced equitions having wider symmetry than the initial ones.