Decay at infinity of solutions to higher order partial differential equations: Removal of the curvature assumption |
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Authors: | Walter Littman |
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Affiliation: | (1) University of Minnesota, USA |
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Abstract: | In an earlier paper a generalization of Rellich’s theorem on the Helmholz equation was obtained for a large class of higher order equationsP(1/i∂/∂x)u=f, subject to the condition that the Gaussian curvature ofP(ξ)=0 never vanish. This restriction is removed in this note. |
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