Otto Liess: Temperate growth at the boundary for solutions of hypoelliptic equations, p.283-295

Abstract:

In our main result we shall consider an hypoelliptic linear partial differential operator $p(x,D)$ with $ {\mathcal C}^{\infty} $ coefficients defined on an open set $U$ and consider a solution $u \in {\mathcal C}^{\infty} (U)$ of the equation $p(x,D)u=0$ which extends to a distribution defined in a neighborhood of some point $ x ^{0}$ in the boundary $ \partial U$ of $U$. If hypoellipticity is a consequence of the existence of a suitable right parametrix of pseudodifferential type, then we shall show that $u$ must have temperate growth at the boundary near $ x ^{0}$.

Key Words: Hypoelliptic operators, parametrices, boundary values.

2000 Mathematics Subject Classification: Primary: 35H10;
Secondary: 35A17, 35G15.

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