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Matematicheskie Zametki, 1975, Volume 17, Issue 6, Pages 899–908 (Mi mzm7610)  

Block sequences in nuclear Fréchet spaces with basis

P. B. Djakov

M. V. Lomonosov Moscow State University
Abstract: It is shown that a block sequence in a nuclear Fréchet space with a basis has a block extension if and only if the subspace it generates is complemented. In addition, a short proof is given of the following result of Dubinsky and Robinson: a nuclear Fréchet space is isomorphic to $\omega=R^N$, $N=\{1,2,\dots\}$ if it has a basis such that any block sequence with blocks of length $\le2$ of any permutation of this basis has a block extension. It is shown that a similar result holds without considering permutations of the basis if the length of the blocks is arbitrary.
Received: 28.10.1974
English version:
Mathematical Notes, 1975, Volume 17, Issue 6, Pages 541–546
DOI: https://doi.org/10.1007/BF01442700
Bibliographic databases:
UDC: 517
Language: Russian
Citation: P. B. Djakov, “Block sequences in nuclear Fréchet spaces with basis”, Mat. Zametki, 17:6 (1975), 899–908; Math. Notes, 17:6 (1975), 541–546
Citation in format AMSBIB
\Bibitem{Dja75}
\by P.~B.~Djakov
\paper Block sequences in nuclear Fr\'echet spaces with basis
\jour Mat. Zametki
\yr 1975
\vol 17
\issue 6
\pages 899--908
\mathnet{http://mi.mathnet.ru/mzm7610}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=399794}
\zmath{https://zbmath.org/?q=an:0325.46008}
\transl
\jour Math. Notes
\yr 1975
\vol 17
\issue 6
\pages 541--546
\crossref{https://doi.org/10.1007/BF01442700}
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