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 Unsolvability of Some Partial Differential Operators Commun. Korean Math. Soc. 1998 Vol. 13, No. 1, 73-76 Rakjoong Kim Hallym University Abstract : It is proved that the partial differential operator $D_x+ ix^qD_y^2$ is not locally solvable in any open set which intersects the line $x=0$, when $q=-\frac{2l-1}{2k-1}$ is not an integer. Keywords : Solvability, unsolvability, partial differential operator of degenerate type MSC numbers : 35A07, 35K65 Downloads: Full-text PDF

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