1) Ibaraki University
semi-euclidean, conformal mapping, ultra-hyperbolic equation, Bateman transformation
In , we proved that any transformation which preserves solutions of the wave equation is a similarity, an inversion, or a Bateman transformation. This paper gives a generalization of the results to ultra-hyperbolic type equations.
Edited and published by : Department of Mathematics, Faculty of Science, Ibaraki University Produced and listed by : Department of Mathematics, Faculty of Science, Ibaraki University