Редукция многомерного уравнения Даламбера к двумерным уравнениям

Анотація

We give a classification of the maximal subalgebras of rank $n — 1$ for the extended Poincare algebra $A \widetilde{P}(1, n)$, which is realized on the set of solutions of the d'Alembeit equation $\Box u + \lambda u^k = 0$. These subalgebras are used for constructing the anzatses reducing this equation to differential equations with two invariant variables.