Rz. Zhdanov et al., ON THE GENERAL-SOLUTION OF THE DALEMBERT EQUATION WITH A NONLINEAR EIKONAL CONSTRAINT AND ITS APPLICATIONS, Journal of mathematical physics, 36(12), 1995, pp. 7109-7127
We construct the general solutions of the system of nonlinear differen
tial equations square(n)u=0, u(mu)u(mu)=0 in the four- and five-dimens
ional complex pseudo-Euclidean spaces. The results obtained are used t
o reduce the multidimensional nonlinear d'Alembert equation square(4)u
=F(u) to ordinary differential equations and to construct its new exac
t solutions. (C) 1995 American Institute of Physics.