Fundamental solutions of evolutionary PDOs and rapidly decreasing distributions

Details Fundamental solutions of evolutionary PDOs and rapidly decreasing distributions Fundamental solutions of evolutionary PDOs and rapidly decreasing distributions

2011-05-04

arxiv.org/abs/1105.0877v1

Mathematics

Functional Analysis

Scientific paper

Let $P(\partial_0,\partial_1,...,\partial_n)$ be a PDO on $\symR^{1+n}$ with constant coefficients. It is proved that (i) the real parts of the $\lambda$-roots of the polynomial $P(\lambda,i\xi_1,...,i\xi_n)$ are bounded from above when $(\xi_1,...,\xi_n)$ ranges over $\symR^n$ if and only if (ii) $P$ has a fundamental solution with support in $H_+=\{(x_0,x_1,\allowbreak..., x_n)\in \symR^{1+n}:x_0\ge0\}$ having some special properties expressed in terms of the L. Schwartz space $\calO^{\prime}_C$ of rapidly decreasing distributions. Moreover, it is proved that the fundamental solution with support in $H_+$ having these special properties is unique.

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