Ivan TSYFRA
Institute of Mathematics,
University of Bialystok,
2 Akademicka Str.,
15-267 Bialystok,
POLAND
   and
Institute of Geophysics of NAS of Ukraine,
32 Paladina Ave.,
Kyiv,
UKRAINE
E-mail: tsyfra@math.uwb.edu.pl, tsyfra@igph.kiev.ua

On a symmetry reduction of nonlinear heat and wave equations

Abstract:
We study the relationship between the existence of symmetry operators and possibilities of reduction of differential equations. The examples of nonlinear heat and wave type equations are considered.