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Partial differential operators with continuous linear right inverse. (English) Zbl 0709.46018
Advances in the theory of Fréchet spaces, Proc. NATO Adv. Res. Workshop, Istanbul/Turkey 1988, NATO ASI Ser., Ser. C 287, 47-62 (1989).
[For the entire collection see Zbl 0699.00024.]
Let $$\Omega$$ be an open convex set in $${\mathbb{R}}^ n$$, $${\mathcal E}(\Omega)$$, $${\mathcal D}'(\Omega)$$ the usual Schwartz’ spaces of functions and distributions and P a polynomial on $${\mathbb{C}}^ n$$; it is proved that the operator P(D) has a continuous right inverse in $${\mathcal E}(\Omega)$$ iff it has a continuous right inverse in $${\mathcal D}'(\Omega)$$; moreover the existence of such a right inverse in both of these spaces is equivalent to the validity of a certain “analytic Phragmen-Lindelöf principle” for the variety $$V=\{P(-z)=0\}$$. It is also shown that in the case $$\Omega ={\mathbb{R}}^ n$$ this principle is very efficient to handle examples. Finally an extensive discussion on Phragmen-Lindelöf conditions on algebraic varieties is presented.
Reviewer: I.Ciorănescu

##### MSC:
 46F10 Operations with distributions and generalized functions 47A05 General (adjoints, conjugates, products, inverses, domains, ranges, etc.) 35A05 General existence and uniqueness theorems (PDE) (MSC2000)