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Published online by Cambridge University Press: 24 October 2008
1. In this paper I establish in a certain sense all the relativistically invariant sets of linear partial homogeneous differential equations in which every unknown function u satisfies being the relativistic Laplace operator. Analogous questions for any orthogonal group are dealt with in a previous paper, but it was thought that an independent and not too technical treatment for the Lorentz group might be of interest.