Factorization of unbounded operators on Kothe spaces

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Terzioglou T., Yurdakul M., Zuhariuta V.

STUDIA MATHEMATICA, vol.161, no.1, pp.61-70, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 161 Issue: 1
  • Publication Date: 2004
  • Doi Number: 10.4064/sm161-1-4
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.61-70
  • Middle East Technical University Affiliated: Yes


The main result is that the existence of an unbounded continuous linear operator T between Kothe spaces lambda(A) and lambda(C) which factors through a third Kothe space A(B) causes the existence of an unbounded continuous quasidiagonal operator from lambda(A) into lambda(C) factoring through lambda(B) as a product of two continuous quasidiagonal operators. This fact is a factorized analogue of the Dragilev theorem [3, 6, 7, 2] about the quasidiagonal characterization of the relation (lambda(A), lambda(B)) is an element of B (which means that all continuous linear operators from lambda(A) to lambda(B) are bounded). The proof is based on the results of [9) where the bounded factorization property BF is characterized in the spirit of Vogt's [10] characterization of B. As an application, it is shown that the existence of an unbounded factorized operator for a triple of Kothe spaces, under some additonal asumptions, causes the existence of a common basic subspace at least for two of the spaces (this is a factorized analogue of the results for pairs [8, 2]).