Olena MAGDA
Institute of Mathematics of NAS of Ukraine,
3 Tereshchenkivs'ka Str.,
01601 Kyiv,
UKRAINE
E-mail: magda@imath.kiev.ua

Invariance of quasi-linear equations of hyperbolic type with respect to four-parametric Lie groups

Abstract:
The problem of description of quasi-linear hyperbolic differential equations in two independent variables, which are invariant under four-parameter Lie groups, are completely solved.