Physics – Mathematical Physics
Scientific paper
2001-12-22
Ukrainian Mathematical Journal, Vol. 53, No. 11, 2001, p. 1841-1850
Physics
Mathematical Physics
14 pages
Scientific paper
A new approach to the problem of group classification is applied to the class of first-order non-linear equations of the form $u_a u_a=F(t,u,u_t)$. It allowed complete solution of the group classification problem for a class of equations for functions depending on multiple independent variables, where highest derivatives enter nonlinearly. Equivalence groups of the class under consideration and algebraic properties of the symmetry algebra are studied. The class of equations considered presents generalisation of the eikonal and Hamilton-Jacobi equations. The paper contains the list of all non-equivalent equations from this class with symmetry extensions, and proofs of such non- equivalence. New first order non-linear equations possessing wide symmetry groups were constructed.
Popovych Roman O.
Yehorchenko Irina A.
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