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Published online by Cambridge University Press: 21 January 2009
We consider a linear partial differential equation with constant coefficients in one dependent and m independent variables, the right-hand side being zero,

P being a symbolic polynomial in D1, …, Dm. If P can be decomposed into two factors, so that the equation can be written

it is evident that the sum of any solution of

and any solution of

is also a solution of (1).