Absolutely Representing Systems of Exponentials in the Spaces of Infinitely-Differentiable Functions and Extendability in the Sense of Whitney

Authors : Yu. F. KOROBEINIK

Pages : 503-518

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Let Q be a compactum in~\mathbb{R}p, p\geqslant1, such that int Q\neq\varnothing and Q=\overline{ int Q}. Denote by C\infty[Q] the space of functions from C\inftyinsert ignore into journalissuearticles values( int Q); uniformly continuous in int Q together with all their partial derivatives. The conditions of the existence of absolutely representing systems of exponentials with purely imaginary exponents in the space C\infty[Q] and some of its subspaces of Denjoy--Carleman type are investigated. It is also proved under rather general assumptions that there is no such absolutely representing systems in the space Einsert ignore into journalissuearticles values(G);=\operatornamewithlimits{proj}\limits {\overleftarrow {Q\in \mathcal{F}G}}E[Q] where G is an arbitrary open set in~\mathbb{R}p, E[Q] is C\infty[Q] or its subspace mentioned above and \mathcal{F}G is the totality of all non-empty compact sets \mathcal{K} in G with the property \mathcal{K}= \overline{ int \mathcal{K}}.
Keywords : Turk J Math, 25, 2001, , 503 518 Turk J Math, vol 25, iss 4