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Mathematical Journal of Ibaraki University
Vol. 48 (2016) p. 1-18

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http://doi.org/10.5036/mjiu.48.1


In [4], 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.

Copyright © 2016 Department of Mathematics, Faculty of Science, Ibaraki University

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